Isotope definition, any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. Isotopes have different mass numbers, though, because they have different numbers of neutrons.. Isotopes are the atoms of an element with different numbers of neutrons. mass # the # of protons + the # of neutrons, mass # = the atomic # atomic # the # of protons (if it is a neutral atom the # of protons = the # of electrons) The number of protons in an atom can tell you what element it is. Definition of Isotopes. Definition of isotope simple. It is used to calculate the changing isotopic ratios as the material is removed from one coexisting phase to the other during the evaporation–condensation processes. Every chemical element has one or more isotopes. Apart from these some other common isotope examples include tin has 22 isotopes zinc has 21 known isotopes neon is a mix of 3 isotopes natural xenon consists of a mixture of 9 stable isotopes nickel has 14 known isotopes. Isotopes. In addition to protons, the atoms of nearly every element also contain neutrons. Isotope vs. nuclide. They have the same proton number, but different mass numbers. An atom is first identified and labeled according to the number of protons in its nucleus. radioisotope [ra″de-o-i´so-tōp] a radioactive form of an element, consisting of atoms with unstable nuclei, which undergo radioactive decay to stable forms, emitting characteristic alpha, beta, or gamma radiation. The first bit is the simple definition, the rest is just more explanation. Isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties. There are 275 isotopes of the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms. A nuclide is a species of an atom with a specific number of protons and neutrons in the nucleus, for example carbon-13 with 6 protons and 7 neutrons. An isotope of a chemical element is an atom that has a different number of neutrons (that is, a greater or lesser atomic mass) than the standard for that element. Different isotopes of the same element have the same atomic number.They have the same number of protons.The atomic number is decided by the number of protons. The nuclide concept (referring to individual nuclear species) emphasizes nuclear properties over chemical properties, whereas the isotope concept (grouping all atoms of each element) emphasizes chemical over nuclear. isotope definition. Elements are defined by the number of protons in the atomic nucleus. Year 10 answer please answer save. a variation of an element, the number of protons always stays the same but the number of neutrons changes. Rayleigh isotopic fractionation is an important type of fractional distillation or condensation under the equilibrium condition. These may occur naturally, as in the cases of radium and uranium, or may be created artificially. Isotope definition: Isotopes are atoms that have the same number of protons and electrons but different... | Meaning, pronunciation, translations and examples Year 10 answer please answer save. Isotopes are atoms with the same number of protons and electrons, but a different number of neutrons. I hope this helps you :) For example, an atom with 6 protons must be carbon, and an atom with 92 protons must be uranium. Isotopes of the same element often have different physical properties, however. What is an Isotope? The word isotope, meaning at the same place, comes from the fact that isotopes are at the same place on the periodic table.