Isotopes are atoms that have the same number of protons (they belong to the same element), but differing numbers of neutrons. Thus, deuterium and tritium are are uncommon isotopes of hydrogen, as these have 1 and 2 neutrons, respectively, whereas most hydrogen has no neutrons.
Sodium chloride is a compound, not an isotope.
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If an element has one and only one stable isotope, an example is Gold.
Deuterium is an example of natural, non-radioactive isotope; deuterium is the isotope of hydrogen with 1 proton and 1 neutron.
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For example a thorium isotope is Th-231 or 23190 Th.
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An example with a zinc isotope: 81Zn (mass number as superscript before the chemical symbol)
Each isotope, stable or unstable, has a specific symbol; for example K-40 for potassium 40.
The chemical symbol of uranium is U.
hydrogen-1hydrogen-2carbon-12etc.