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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.
Any argon present in a mineral containing potassium-40 must have been formed as the result of radioactive decay.
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Contrary to creationist claims, it is possible to make that determination, as the following will explain: By way of background, all atoms of a given element have the same number of protons in the nucleus; however, the number of neutrons in the nucleus can vary.
An atom with the same number of protons in the nucleus but a different number of neutrons is called an isotope.
Carbon-14 dating: See Carbon 14 Dating in this web site.
Rubidium-Strontium dating: The nuclide rubidium-87 decays, with a half life of 48.8 billion years, to strontium-87.