Question

why is carbon 12 used as standard for atomic mass?​

Answer 1

Carbon 12 was chosen because the chemical atomic weights based on C12 are almost identical to the chemical atomic weights based on the natural mix of oxygen. Because no other nuclides other than carbon-12 have exactly whole-number masses on this scale. Carbon-12 is composed of 6 protons, 6 neutrons, and 6 electrons.

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Answer 2

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Carbon-12 is of particular importance in its use as the standard from which atomic masses of all nuclides are measured, thus, its atomic mass is exactly 12 daltons by definition. Carbon-12 is composed of 6 protons, 6 neutrons, and 6 electrons.

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