Answer:
carbon-12
Explanation:
One atomic mass unit is approximately the mass of Hydrogen-1, a proton, a neutron, and precisely one-twelfth the mass of Carbon-12, meaning that Carbon-12's atomic mass is 12u.
The mass of carbon atom is 12 u.
The mass of a thing is a measurement of how much matter it contains.
Carbon is just a chemical substance with both the atomic number 6 and the symbol C.
The atomic number carbon is 6 and atomic mass is 12 u
Therefore, the carbon atom posses 12 u mass.
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