Number of protons in carbon-12

6

Note:

Please check Rasputin020's answer instead of this, It's more detailed.

6 protons

Explanation:

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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