Example of radioactive dating
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Therefore the relative amounts of rubidium87 and strontium87 can be determined by expressing their ratios to strontium86: Rb87/Sr86 and Sr87/Sr86 We measure the amounts of rubidium87 and strontium87 as ratios to an unchanging content of strontium86.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.An atom with the same number of protons in the nucleus but a different number of neutrons is called an isotope.
For example, uranium238 is an isotope of uranium235, because it has 3 more neutrons in the nucleus.
It has the same number of protons, otherwise it wouldn't be uranium.
Example of radioactive dating comments 

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