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.
For example a thorium isotope is Th-231 or 23190 Th.
An example of an isotope in my house would be carbon-14, which is used in carbon dating to determine the age of organic materials.
An example with a zinc isotope: 81Zn (mass number as superscript before the chemical symbol)
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Each isotope, stable or unstable, has a specific symbol; for example K-40 for potassium 40.
An example of an atom is carbon (C), which has six protons. An example of an ion is a chloride ion (Cl-), which has gained an electron. An example of an isotope is carbon-14 (14C), which has 8 neutrons instead of the usual 6.
hydrogen-1hydrogen-2carbon-12etc.
Ionized hydrogen-1 isotope is identical to a proton.
The parent isotope is the original radioactive isotope that undergoes decay to form the daughter isotope. The daughter isotope is the stable isotope that is formed as a result of the radioactive decay of the parent isotope.