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.
Three of the Carbon isotopes (C) are found in nature.
The rest of the carbon isotopes are only of laboratory interest.
Carbon dating is somewhat accurate because we are able to determine what the ratio was in the unobservable past to a certain extent.
By taking a carboniferous specimen of known age (that is, a specimen which we are able to date with reasonable certainty through some archaeological means), scientists are able to determine what the ratio was during a specimen's lifetime.
Evolutionists assume that the rate of cosmic bombardment of the atmosphere has always remained constant and that the rate of decay has remained constant.
Scientists place great faith in this dating method, and yet more than 50% of radiocarbon dates from geological and archaeological samples of northeastern North America have been deemed unacceptable after investigation.
Carbon dating is used to work out the age of organic material — in effect, any living thing.
Other atoms are also named based on the number of protons they carry.
Notice in the diagram that eight different isotopes of Carbon are illustrated.
Furthermore, the ratio is known to fluctuate significantly over relatively short periods of time (e.g.
Unfortunately the ratio of carbon-12 to carbon-14 has yet to reach a state of equilibrium in our atmosphere; there is more carbon-14 in the air today than there was thousands of years ago.