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About 21 pounds of Nitrogen is converted each year making about 1/trillion atmospheric carbon atoms radioactive C.
Then an age can be obtained for the organic material.
Most nitrogen atoms have seven protons and seven neutrons, so their atomic mass is 7 7 = 14.
The fact that it has seven protons is what makes it nitrogen.
Remember that the Atomic Number (the bottom number) indicates the number of protons.
To understand this process we must first understand a little bit about the atoms themselves and how they get their names.
Most carbon atoms have six positively charged protons and six uncharged neutrons.
So simple arithmetic should tell us the number of neutrons. Carbon 10 would have 4 neutrons and Carbon 11 would have 5 neutrons, and so on.
What should catch your attention is the nature of the various carbon isotopes.