Carbon-12

Carbon-12 is the most abundant (98.89%) of the two stable isotopes of the element carbon. It contains 6 protons, 6 neutrons and 6 electrons.

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Carbon-12 is of particular importance as it is used as the standard from which all other isotopes' atomic weight is measured and thus the measurement of Avogadro's number.

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Prior to 1959 both the IUPAP and IUPAC tended to use used oxygen to define the mole, the chemists defining the mole as the number of atoms of oxygen which had mass 16 g, the physicists using a similar definition but with the oxygen-16 isotope only. The two organisations agreed in 1959/1960 to define the mole as:

Isotope: Isotopes are forms of an element whose nuclei have the same atomic number?-the number of protons in the nucleus--but different atomic masses because they contain different numbers of neutrons....

Carbon: :Alternative meaning: Carbon (API)...

Protons: REDIRECT Proton...

Carbon-12 related Images and Photos (experimental)

Carbon/Silicon: The Last Post	Carbon/Silicon: The Last Post	generic humanoid carbon unit	Fluorine Uranium Carbon Potassium
BATMAN Stainless Steel Carbon Fiber Cuff Links	Wild Horses Running Carbon County Wyoming USA	View of the Grand Canal from the Riva Del Vin and Riva Del Carbon