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Carbon-14 has two more neutrons than stable carbon, and thus has a mass that is greater by two.Carbon-14 is produced by a chemical reaction between stable Nitrogen atoms or ions and free neutrons in the atmosphere.Carbon's most abundant and stable isotope has a mass of 12 (six protons and six neutrons).However, there is also a neutron-rich radioactive isotope of carbon.

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Every living organism on the planet contains the element carbon.

However, Lead is not easily incorporated into the Zircon molecules; therefore, when a sample of Zircon is analyzed any lead that is found must have come directly from Uranium decay.

There are two isotopes of Uranium, both of which are radioactive.

One of the primary decay products of K-40 is Ar-40--a stable and unreactive gas.

Potassium decay has been established as the only source of Argon in volcanic rocks; it is a gas so most of it escapes unless it is formed after the molten rock has solidified, and it is not a major product in any other reactions.

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