The mass of 12C is 12 u where 1 u = 1.660 559 × 10^?27 kg. This mass is equal to

a. the mass of the 12C nucleus.
b. the mass of the 12C nucleus plus 6 electrons.
c. the mass of the 12C nucleus plus 12 electrons.
d. the mass of 6 protons and 6 neutrons.


b

Physics & Space Science

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