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Recall that atoms are the basic building blocks of matter.
Atoms are made up of much smaller particles called protons, neutrons, and electrons.
Protons and neutrons make up the center (nucleus) of the atom, and electrons form shells around the nucleus.
The number of protons in the nucleus of an atom determines the element.
Note that, contrary to a popular misconception, carbon dating is not used to date rocks at millions of years old.
Before we get into the details of how radiometric dating methods are used, we need to review some preliminary concepts from chemistry.
So, a carbon atom might have six neutrons, or seven, or possibly eight—but it would always have six protons.
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Many people have been led to believe that radiometric dating methods have proved the earth to be billions of years old.The variation is certainly partially the result of a change in the cosmic ray production rate of radiocarbon.
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