Rubidium strontium dating meteorites
Because of radioactivity, the fraction of rubidium-87 decreases from an initial value of 100% at the time of formation of the mineral, and approaches zero with increasing number of half lives.
Because argon is an inert gas, it is not possible that it might have been in the mineral when it was first formed from molten magma.
An atom with the same number of protons in the nucleus but a different number of neutrons is called an isotope.
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