Specifically, they are two isotopes of the same chemical element, due to the number of protons being fixed according to the element's atomic number. Every isotope is characterized by an integer value known as a mass number, related to the composition of the nucleus. This becomes part of the isotope notation. Answer and Explanation: 1Elements have families as well, known as isotopes. Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. The number of protons in a nucleus determines the element’s atomic number on the Periodic Table. For example, carbon has six protons and is atomic number 6.Isotopes of the same element have the same number of protons and electrons when in neutral atomic form. Different isotopes have different numbers of neutrons in their nuclei, resul...Aug 2, 2021 · When employing formal scientific isotope notation, an isotope is usually expressed in longhand as the name of the chemical element, followed immediately by a dash, and then the mass number (A), i.e. "element-A". When abbreviated, the element's symbol is used, prefixed by a superscripted mass number, above a subscripted atomic number. In ... Aluminium or aluminum ( 13 Al) has 22 known isotopes from 22 Al to 43 Al and 4 known isomers. Only 27 Al ( stable isotope) and 26 Al ( radioactive isotope, t 1/2 = 7.2 × 105 y) occur naturally, however 27 Al comprises nearly all natural aluminium. Other than 26 Al, all radioisotopes have half-lives under 7 minutes, most under a second. Music has been an integral part of human culture for centuries. From ancient civilizations to modern times, people have used various systems to notate and communicate musical ideas...Aluminium or aluminum ( 13 Al) has 22 known isotopes from 22 Al to 43 Al and 4 known isomers. Only 27 Al ( stable isotope) and 26 Al ( radioactive isotope, t 1/2 = 7.2 × 105 y) occur naturally, however 27 Al comprises nearly all natural aluminium. Other than 26 Al, all radioisotopes have half-lives under 7 minutes, most under a second.Potassium ( 19 K) has 26 known isotopes from 31 K to 57 K, with the exception of still-unknown 32 K, as well as an unconfirmed report of 59 K. Three of those isotopes occur naturally: the two stable forms 39 K (93.3%) and 41 K (6.7%), and a very long-lived radioisotope 40 K (0.012%) . Naturally occurring radioactive 40 K decays with a half-life …The way we represent these isotopes is through what we call isotope notation. Now this is just the representation for an isotope, and it includes its atomic number, which, remember, is Z. It's mass number, which is a and now it's elements Symbol X. Remember, our periodic table of the elements has the display of all the elements that we know off ... Cobalt-60. Cobalt-60 ( 60 Co) is a synthetic radioactive isotope of cobalt with a half-life of 5.2714 years. [3] [4] : 39 It is produced artificially in nuclear reactors. Deliberate industrial production depends on neutron activation of bulk samples of the monoisotopic and mononuclidic cobalt isotope 59. . [5]The alkaline earth metal strontium (38 Sr) has four stable, naturally occurring isotopes: 84 Sr (0.56%), 86 Sr (9.86%), 87 Sr (7.0%) and 88 Sr (82.58%). Its standard atomic weight is 87.62(1).. Only 87 Sr is radiogenic; it is produced by decay from the radioactive alkali metal 87 Rb, which has a half-life of 4.88 × 10 10 years (i.e. more than three times longer than …Feb 4, 2020 · Isotope Examples. Carbon 12 and Carbon 14 are both isotopes of carbon, one with 6 neutrons and one with 8 neutrons (both with 6 protons). Carbon-12 is a stable isotope, while carbon-14 is a radioactive isotope (radioisotope). Uranium-235 and uranium-238 occur naturally in the Earth's crust. Both have long half-lives. Question: Enter the appropriate symbol for an isotope of calcium-42 corresponding to the isotope notation^A_Z_X. Express your answer as a chemical symbol using isotope notation. Show transcribed image text. Here’s the best way to solve it.Any given element can have more than one isotope. To distinguish between the different isotopes of an atom, the element is named with its mass number, for example lithium-7. Remember that the mass number is the number of protons and neutrons. When symbols are used to represent an isotope the mass number is written next to the symbol on the top ...Notice how the isotope notation changes when you do this. A. What does the top number equal? 4 B. Which particle determines the atomic number? Protons In isotope notation there are two numbers to the left of the element symbol. The …So carbon hyphen 13 refers to this isotope of carbon and this is called hyphen notation. So let me go ahead and write this hyphen notation. Alright, let's do one more example here. Let's do one that looks a little bit scarier. So let's do uranium. So U is uranium. The atomic number of uranium is 92. The mass number for this isotope is 235.Standard nuclear notation shows the chemical symbol, the mass number and the atomic number of the isotope. Example: the isotopes of carbon. The element is ...Isotope notation, also known as nuclear notation, is a method used to identify isotopes. It involves the chemical symbol, the atomic number, and the mass number of an isotope. For example, the isotope notation of carbon-12 is ¹²C. Here, 12 is the mass number (number of protons + neutrons), C is the chemical symbol, and the atomic number (number of …The delta notation (symbol: δ) expresses the variation of the isotopic ratio “R” of an element (e.g., 18 O/ 16 O), relative to the same ratio in a standard “R std ” and normalized to this standard ratio, or (R-R std)/R std.The delta notation is usually expressed in per mil (parts per thousand, ‰) and it is obtained by multiplying the previous …Isotopic Notation for the Isotope Carbon-14, The atomic number (number of protons) for the element carbon is 6 according to the periodic table. Carbon-14 is named from the isotope’s mass number, which is 14. Carbon is denoted by the chemical symbol C. Now write the carbon-14 isotopic notation. Although all isotopes of an element have roughly ... Learn how to identify and calculate the relative abundances of isotopes using mass spectrometry, a technique that ionizes and deflects ions based on their mass-to-charge ratios. Find out how to use the unified atomic mass unit, the mass number, and the isotope notation to describe the atomic structure and properties of elements. 30 Jul 2021 ... In this video, we are going to talk about isotopes and ions. ISOTOPES are atoms of the same element. They always have the same number of ...Isotopic Notation for the Isotope Carbon-14, The atomic number (number of protons) for the element carbon is 6 according to the periodic table. Carbon-14 is named from the isotope’s mass number, which is 14. Carbon is denoted by the chemical symbol C. Now write the carbon-14 isotopic notation. Although all isotopes of an element have roughly ... There are two types of isotope notation (also called nuclear notation) for the element Calcium (Ca). Both show the difference in the number of neutrons (and...Isotopes of silver. Naturally occurring silver ( 47 Ag) is composed of the two stable isotopes 107 Ag and 109 Ag in almost equal proportions, with 107 Ag being slightly more abundant (51.839% natural abundance ). Notably, silver is the only element with all stable istopes having nuclear spins of 1/2. Thus both 107 Ag and 109 Ag nuclei produce ... 26 Oct 2017 ... Oct 26, 2017 - This Pin was discovered by Angelina Zanti-Hindle. Discover (and save!) your own Pins on Pinterest.Apr 19, 2023 · The symbols for the two naturally occurring isotopes of chlorine then would be Cl and Cl. Strictly speaking, the subscript is unnecessary, since all atoms of chlorine have 17 protons. Hence the isotope symbols are usually written without the subscript: 35 Cl and 37 Cl. In discussing these isotopes, we use the. terms chlorine-35 and chlorine-37. Name of the isotope: Aluminium-27; Al-27 Symbol: 27 Al or 2713 Al Mass number A: 27 (= number of nucleons) Atomic number Z: 13 (= number of protons) Neutrons N: 14 Isotopic mass: 26.9815385 (7) u ( atomic weight of Aluminium-27) Nuclide mass: 26.974407 u (calculated nuclear mass without electrons) Mass excess: -17.19678 MeV Mass defect: 0. ...Aug 2, 2021 · When employing formal scientific isotope notation, an isotope is usually expressed in longhand as the name of the chemical element, followed immediately by a dash, and then the mass number (A), i.e. "element-A". When abbreviated, the element's symbol is used, prefixed by a superscripted mass number, above a subscripted atomic number. In ... Isotopes of xenon. Complete table of nuclides. Xenon-133 (sold as a drug under the brand name Xeneisol, ATC code V09EX03 ( WHO )) is an isotope of xenon. It is a radionuclide that is inhaled to assess pulmonary function, and to image the lungs. [16] It is also used to image blood flow, particularly in the brain.The IPTEI is modeled on the familiar Periodic Table of the Chemical Elements. The IPTEI is intended to hang on the walls of chemistry laboratories and classrooms. …No headers. Hydrogen has three naturally occurring isotopes, denoted 1 H, 2 H and 3 H. Other, highly unstable nuclei (4 H to 7 H) have been synthesized in the laboratory but are not observed in nature.1 H is the most common hydrogen isotope with an abundance of more than 99.98%. Because the nucleus of this isotope consists of only a single proton, …Definition. Silicon (Si) is an element present in all natural environments, including the biosphere. It has three stable isotopes of mass 28, 29, and 30, respectively. Its isotopic composition is expressed in the delta notation δ 30 Si ( 30 Si/ 28 Si) and δ 29 Si ( 29 Si/ 28 Si) in per mil units normalized to a standard reference (see delta ...Isotopes are used to sterilize medical equipment and perform diagnostic imaging scans and radiopharmaceutical evaluations and treatments in medical settings. They are also used in ...Rubidium (37 Rb) has 36 isotopes, with naturally occurring rubidium being composed of just two isotopes; 85 Rb (72.2%) and the radioactive 87 Rb (27.8%). Normal mixes [clarification needed] of rubidium are radioactive enough to fog photographic film in approximately 30 to 60 days.. 87 Rb has a half-life of 4.92 × 10 10 years.It readily substitutes for potassium in …7 Jul 2021 ... The isotope sign, also known as isotope notation or nuclear notation, represents an isotope's atomic number $ ,Z, $ as well as its mass ...Naturally occurring barium (56 Ba) is a mix of six stable isotopes and one very long-lived radioactive primordial isotope, barium-130, identified as being unstable by geochemical means (from analysis of the presence of its daughter xenon-130 in rocks) in 2001. This nuclide decays by double electron capture (absorbing two electrons and emitting two …The isotope with 13 protons and 14 neutrons is aluminum-14. The element of the isotope can be determined by either the number of electrons or protons, which are equal to the atomic...Isotopes of beryllium. ) is stable and a primordial nuclide. As such, beryllium is considered a monoisotopic element. It is also a mononuclidic element, because its other isotopes have such short half-lives that none are primordial and their abundance is very low ( standard atomic weight is 9.012 1831(5) ). Beryllium is unique as being the only ...In isotope notation, you can quickly show how many protons, neutrons, and electrons are in an atom. You put the atomic number, mass number, and net charge around the …Feb 4, 2020 · Isotope Examples. Carbon 12 and Carbon 14 are both isotopes of carbon, one with 6 neutrons and one with 8 neutrons (both with 6 protons). Carbon-12 is a stable isotope, while carbon-14 is a radioactive isotope (radioisotope). Uranium-235 and uranium-238 occur naturally in the Earth's crust. Both have long half-lives. Isotope Notation Subscripts and superscripts can be added to an element’s symbol to specify a particular isotope of the element and provide other important information.30 Jul 2021 ... In this video, we are going to talk about isotopes and ions. ISOTOPES are atoms of the same element. They always have the same number of ...This is why radioactive isotopes are dangerous and why working with them requires special suits for protection. The isotope of carbon known as carbon-14 is an example of a radioisotope. In contrast, the carbon isotopes called carbon-12 and carbon-13 are stable. This whole discussion of isotopes brings us back to Dalton's Atomic Theory.In this video, we are going to go through how to write in isotopic symbol, or also known as isotope notation or nuclear notation. Basically, isotopic symbol ...30 Jul 2021 ... In this video, we are going to talk about isotopes and ions. ISOTOPES are atoms of the same element. They always have the same number of ...Isotopes. Isotope Notation . Symbolic Notation. Ion Charge. Atomic Mass. Chromium has three naturally occurring isotopes. They have mass numbers of 50, 52, and 54. Describe how atoms of these isotopes differ. All naturally occurring atoms of fluorine have a mass number of 19. Determine the number of protons, electrons, and neutrons in any atom ...May 19, 2011 · Walkthrough of determining the number of protons, electrons, and neutrons of a few atoms and ions that are expressed in various forms of notation. Learn what isotopes are, how they are notated, and how they differ from natural and radioactive elements. Find out the properties, formation, and radiation types of isotopes of the same element with examples and interactive charts. By the end of this lesson, students should be able to: Define isotope and use nuclear symbol notation to determine the number of particles in the nucleus of an isotope. Apply the concepts of various kinds of nuclear decay in order to predict how parent isotopes decay into daughter isotopes. Discuss and evaluate the applications of isotopes.Isotopes are atoms that have the same numbers of protons but different numbers of neutrons. An ion is an atom that has gained or lost electrons, so it now has more or fewer electrons than it does protons. So an ion has a negative or positive charge. All atoms are isotopes and if an isotope gains or loses electrons it becomes an ion.An isotope is a sample of an element with different numbers of neutrons in its atoms. Learn how to indicate isotopes, the chemical and physical properties of …When employing formal scientific isotope notation, an isotope is usually expressed in longhand as the name of the chemical element, followed immediately by a …Definition. Silicon (Si) is an element present in all natural environments, including the biosphere. It has three stable isotopes of mass 28, 29, and 30, respectively. Its isotopic composition is expressed in the delta notation δ 30 Si ( 30 Si/ 28 Si) and δ 29 Si ( 29 Si/ 28 Si) in per mil units normalized to a standard reference (see delta ...Jan 18, 2024 · Find the number of protons (atomic number). Find the number of neutrons by subtracting the number of protons from the mass number. Add the protons and neutrons. Omit the electrons, as their combined mass is very small compared to the mass of the nucleus. Congratulations! Now you have the atomic mass of that atom. Isotope Maker. Construct the following isotopes. Nitrogen-14. Oxygen-18. 19 F -. 32 S 2-. Atomic Structure Links. Chemical Demonstration Videos.Enter the appropriate symbol for an isotope of calcium-42 corresponding to the isotope notation AZX. 80. Solution. Zoe. Math teacher · Tutor for 5 years. Answer. 40 20Ca this is the appropriate symbol for an isotope of calcium-42 corresponding to the isotope notation AZX. Click to rate: 4.7 (759 votes)Chemistry. Antimony has many uses, including infrared devices and as part of an alloy in lead storage batteries. The element has two naturally occurring isotopes, one with mass 120.904 amu, the other with mass 122.904 amu. A (a) Enter the X notation for each isotope. antimony–121 antimony–123 (b) The atomic mass of antimony is 121.8 amu.The isotopic notation given is in the form of. Where X is the symbol for the element, Z is the atomic number (number of protons) and A is the atomic mass number (number of protons plus number of neutrons). Since the atomic number is 6 we can also find this on the periodic table to be carbon. The isotope now can be written as Isotope Notation Mass Number 23 Na 11 Atomic Number Is the number of protons plus the number of neutrons. This number tells us the kind of isotope.To see all my Chemistry videos, check outhttp://socratic.org/chemistryWe'll learn about what isotopes are and how to write atomic number and mass number in i...Caesium-137 (137 55 Cs), cesium-137 (US), or radiocaesium, is a radioactive isotope of caesium that is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons.Trace quantities also originate from spontaneous fission of uranium-238.It is among the most …The relative abundances of the four stable isotopes are approximately 1.5%, 24%, 22%, and 52.5%, combining to give a standard atomic weight (abundance-weighted average of the stable isotopes) of 207.2(1). Lead is the element with the heaviest stable isotope, 208 Pb. The superscript ' 3+ 3 + ' denotes a normalised electric charge. Charges are quantised, that is they take on only certain discrete values. Neutrons do not have a net charge ( q = 0 q = 0 ). Electrons and protons have the same absolute charge [footnote]. They …List, data and properties of all known isotopes of Nickel. All atomic nuclei of the chemical element nickel are summarized under nickel isotopes; these all consist of an atomic nucleus with 28 protons and, in the uncharged state, 28 electrons. The difference between each nickel isotope is based on the number of neutrons in the nucleus.Beyond the U isotope data, these datasets generally include only a limited amount of relevant information/data for each sample. As a result, ... (238 U/ 235 U, expressed as δ 238 U in δ notation), which is investigating non-radiogenic and non-fissiogenic U isotopic fractionation that occurred during geo ...Solution for Write the following isotopes in nuclide notation (e.g., "14/6 C")(a) oxygen-14(b) copper-70(c) tantalum-175(d) francium-217. Skip to main content. close. Start your trial now! First week only $4.99! arrow ... Explain how you can predict whether or not an isotope is likely to be stable ifyou know its number ...Potassium-40 (40 K) is a radioactive isotope of potassium which has a long half-life of 1.25 billion years. It makes up about 0.012% (120 ppm) of the total amount of potassium found in nature.. Potassium-40 undergoes three types of radioactive decay.In about 89.28% of events, it decays to calcium-40 (40 Ca) with emission of a beta particle (β −, an electron) …Cr has an atomic number ( Z) of 24, so it has 24 p +. With 24 p + and 30 n 0, the mass number of this atom is 54. The isotope notations include: chromium-54 Cr-54 54Cr 54 C r 5424Cr 24 54 C r chromium-54 Cr-54 54Cr 54 C r 5424Cr 24 54 C r Isotopes are simply specifying the number of neutrons and protons (together called nucleons) in the atom. So, Carbon-12, which has an atomic mass number of 12, has 6 neutrons (12 nucleons - 6 protons = 6 neutrons). Carbon-13, which has an atomic mass number of 13, has 7 neutrons (13 nucleons - 6 protons = 7 neutrons). A represents the isotope’s mass number and symbol Z represents the isotope’s atomic number. All isotopes of an element have the same number of protons and electrons, which means they exhibit similar chemical properties. (credit: “ 1.6 Isotopes and Atomic Masses” In Principles of General Chemistry (v. 1.0) by Anonymous, CC BY-NC-SA 3.0 ... Notation. An isotope and/or nuclide is specified by the name of the particular element (this indicates the atomic number) followed by a hyphen and the mass number (e.g. helium-3, helium-4, carbon-12, carbon-14, uranium-235 and uranium-239). Calculate average atomic mass and isotopic abundance; ... For example, Co is the symbol for the element cobalt, but CO is the notation for the compound carbon monoxide, which contains atoms of the elements carbon (C) and oxygen (O). All known elements and their symbols are in the periodic table in Figure 2.26 (also found in Appendix A).5 Aug 2021 ... Share your videos with friends, family, and the world.Interpreting Chemical Symbol. 5. Definition of Isotopes Isotopes are atoms of the same element which contains the same number of protons but different number of neutrons. 6. Isotopes O 16 8 mass number proton number Oxygen-16 Oxygen-17 Oxygen-18 O O 17 8 18 8 n = 8 n = 17 – 8 = 9 n = 18 – 8 = 10. 7.18 Oct 2017 ... An isotope is an element that does not have the same number of protons and neutrons. For example carbon has an atomic number of 6 and ...For carbon, the notation would be 12 6 C for carbon-12 and 13 6 C for carbon-13. Sometimes the atomic number is dropped, and the isotope is just written as the mass number and the element symbol. For example, carbon-13 would be written at 13 C in this notation. Common Isotopes and Their Uses. All elements have isotopes. However, some have more ... 10.3: Isotopes of Hydrogen. Hydrogen has three naturally occurring isotopes, denoted 1 H, 2 H and 3 H. Other, highly unstable nuclei ( 4 H to 7 H) have been synthesized in the laboratory but are not observed in nature. 1 H is the most common hydrogen isotope with an abundance of more than 99.98%. Because the nucleus of this isotope consists of ... Isotopes of silver. Naturally occurring silver ( 47 Ag) is composed of the two stable isotopes 107 Ag and 109 Ag in almost equal proportions, with 107 Ag being slightly more abundant (51.839% natural abundance ). Notably, silver is the only element with all stable istopes having nuclear spins of 1/2. Thus both 107 Ag and 109 Ag nuclei produce ... For carbon, the notation would be 12 6 C for carbon-12 and 13 6 C for carbon-13. Sometimes the atomic number is dropped, and the isotope is just written as the mass number and the element symbol. For example, carbon-13 would be written at 13 C in this notation. Common Isotopes and Their Uses. All elements have isotopes. However, some have more ... Isotopes of beryllium. ) is stable and a primordial nuclide. As such, beryllium is considered a monoisotopic element. It is also a mononuclidic element, because its other isotopes have such short half-lives that none are primordial and their abundance is very low ( standard atomic weight is 9.012 1831(5) ). Beryllium is unique as being the only ...Learn how to write the isotope notation for different isotopes of the same element using a symbol and a superscript. Find examples, definitions, and answers to common questions about isotope notation. See how isotope notation is important for nuclear chemistry and …Isotopic mass balances, and. • Isotope effects and their consequences in open and closed systems. Notation. Absolute abundances of isotopes are com- monly ...The days when calculators just did simple math are gone. Today’s scientific calculators can perform more functions than ever, basically serving as advanced mini-computers to help m...Because all of the isotopes of an element have the same atomic number, the atomic number is often left off the isotope notation. Another way of naming isotopes uses the name of the element followed by the isotope’s mass number. For example, carbon-14 can be described in two ways: All isotopes of an element have essentially the same chemical ...
The mass number of an isotope is usually supercripted to the upper left of the elemental symbol. Sometimes, the atomic number, Z is subscripted to the lower left, however, the elemental symbol unequivocally identifies the element's identity, and thus identifies Z. For common hydrogen isotopes, protium, deuterium, and tritium, we would …. Providers debit card customer service
Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the …Isotopes close isotope Atoms of an element with the same number of protons and electrons but different numbers of neutrons. of an element close element A substance made of one type of atom only ...Learn what is isotopic notation, how to write it for different isotopes of the same element, and how to use it for carbon-14. Find out the advantages and disadvantages of isotopic …Let me write it over here, chlorine 35. It's sometimes written like this, in fact it's often written like this, chlorine 35 and this isotope notation that you see over here where we have 35 in the top left, that 35 is the sum of this version, this isotope of chlorines protons and neutrons. This number 35 is this isotope of chlorines mass number. To perform the calculation, one must use the following formula: (b)x + (1-x)(c) = a and the unknown abundance is the “x.”. “B” refers to the first isotope’s atomic mass and “c” ref...Mar 1, 2019 · The IUPAC Periodic Table of the Elements and Isotopes (IPTEI) was created to familiarize students, teachers, and non-professionals with the existence and importance of isotopes of the chemical elements. The IPTEI is modeled on the familiar Periodic Table of the Chemical Elements. The IPTEI is intended to hang on the walls of chemistry laboratories and classrooms. This isotope is symbolized using a nuclear symbol. In this notation, the atomic number of the isotope is written as a subscript. Since the atomic number indicates both the number of protons and the number of …Sep 13, 2019 · The atomic mass of an element on the periodic table is an average of the masses of the naturally occurring isotopes of that element. Isotope Notation. There are two common methods of writing isotopes: (1) The element name or symbol is listed first, followed by a dash and then the mass number of the isotope. Isotope Notation. There are several ways scientists denote an isotope in writing. One way is to write the element name followed by the number of neutrons and protons added together. The number of protons plus neutrons also equals the mass number. For example, a carbon with 7 neutrons and 6 protons (instead of 6 neutrons and 6 protons) would be ...Isotopes of fluorine. ). Only fluorine-19 is stable and naturally occurring in more than trace quantities; therefore, fluorine is a monoisotopic and mononuclidic element . ; it has a half-life of 109.734 (8) min. All other fluorine isotopes have half-lives of less than a minute, and most of those less than a second.Learn how to identify and calculate the relative abundances of isotopes using mass spectrometry, a technique that ionizes and deflects ions based on their mass-to-charge ratios. Find out how to use the unified atomic …Introduction. As mentioned before, isotopes are atoms that have the same atomic number, but different mass numbers. Isotopes are denoted the same way as nuclides, but they are often symbolized only with the mass numbers because isotopes of the same element have the the same atomic number.Carbon, for example, has two …List, data and properties of all known isotopes of Nickel. All atomic nuclei of the chemical element nickel are summarized under nickel isotopes; these all consist of an atomic nucleus with 28 protons and, in the uncharged state, 28 electrons. The difference between each nickel isotope is based on the number of neutrons in the nucleus.General data. Name of the isotope: Copper-63; Cu-63 Symbol: 63 Cu or 6329 Cu Mass number A: 63 (= number of nucleons) Atomic number Z: 29 (= number of protons) Neutrons N: 34 Isotopic mass: 62.929598 (4) u ( atomic weight of Copper-63) Nuclide mass: 62.9136896 u (calculated nuclear mass without electrons) Mass excess: -65.57904 MeV …uranium-235 (U-235), radioactive isotope of the element uranium with a nucleus containing 92 protons and 143 neutrons.Uranium-235 is the only naturally occurring fissile material; that is, the uranium-235 nucleus undergoes nuclear fission when it collides with a slow neutron (a neutron with a kinetic energy less than 1 electron volt).. Uranium …Isotopes are simply specifying the number of neutrons and protons (together called nucleons) in the atom. So, Carbon-12, which has an atomic mass number of 12, has 6 neutrons (12 nucleons - 6 protons = 6 neutrons). Carbon-13, which has an atomic mass number of 13, has 7 neutrons (13 nucleons - 6 protons = 7 neutrons). Examples of isotopes are O-16, O-17 and O-18. These isotopes can be used in forensics, but are even more accurate in their ability to tell whether a certain rock originated on Eart....