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Rubidium-Strontium dating: The nuclide rubidium-87 decays, with a half life of 48.8 billion years, to strontium-87.
Strontium-87 is a stable element; it does not undergo further radioactive decay.
Each element has a few varieties with the same number of protons, but different numbers of neutrons in the nucleus.
However, any escaping argon gas would lead to a determined age younger, not older, than actual.The creationist "argon escape" theory does not support their young earth model.) The argon age determination of the mineral can be confirmed by measuring the loss of potassium.In old rocks, there will be less potassium present than was required to form the mineral, because some of it has been transmuted to argon.Radiometric dating is a means of determining the "age" of a mineral specimen by determining the relative amounts present of certain radioactive elements.By "age" we mean the elapsed time from when the mineral specimen was formed.