\\\¦ī-sə-¦tōp\\\ [is- + Gk topos place] (1913) n. In chemistry, one of two or more forms of an element ("nuclides") having the same number of protons in the nucleus but differing in mass number because ofSpringer New YorkEncyclopedic Dictionary of Polymers...
One of two or more species of atoms of an element with the same atomic number but different atomic masses.
Isotopes are variants of a particular chemical element that differ in neutron numbe, although all isotopes of a given element have the same number of protons in each atom. Isotope labeling is a common application of isotope, that is, the use of unusual isotopes as tracers or markers in chemi...
if their nucleus has the same number of protons (same charges) but a different number of neutrons (different mass numbers). Because their electronic shells must balance the nuclear charge, isotopes have the same electronic configuration and, hence, very similar chemical properties. Isotopes can be...
Isotopes of the same element (of the same Z = number of protons or atomic number of element) are by definition nuclides with different mass m and mass number A (A = Z + N) due to the different number of neutrons (N) in the nucleus. Isotope analyses are of special interest for ...
One of two or more atoms that have the same number of protons but a different number of neutrons. Carbon 12, the most common form of carbon, has six protons and six neutrons, whereas carbon 13 has six protons and seven neutrons.
Presently, the oldest evidence of microbial life on Earth comes to us in the form of stable isotopes. The chemical elements charted on the periodic are defined by the number of protons in their nuclei, for example, hydrogen atoms have one proton, helium atoms have two, carbon atoms contain ...
Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number. All isotopes of a given element have the same number of protons but different numbers of neutrons in each atom.
Isotope and nuclide are closely related terms. When one speaks of isotopes, they are referring to the set of nuclides that have the same number of protons. Nuclide is a more general term, referring to a nuclear species that may or may not be isotopes of a single element. Examples: ...
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. There are 275 isotopes of the 81 stable elements, in addition to over 800 ra...