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" ... Most of Earth's atmosphere — about 78% — is made up of nitrogen gas, which itself is a diatomic molecule made of two nitrogen atoms. Each time a neutron collides with a nitrogen nucleus, which consists of 7 protons and 7 neutrons, there's a finite probability that it will react with that nucleus, replacing one of the protons. As a result, a nitrogen-14 atom (and a neutron) transforms into a carbon-14 atom (and a proton). ... "