Question

is the atomic mass of magnesium and is the atomic mass of calcium

• A. 28
• B. 24
• C. 40
• D. 27

Answer 1

Answer: (B), (C)

40

The mass of an atom is measured in terms of atomic mass unit (1 amu).
1 amu is defined as the mass equal to one-twelfth (1/12th) of the mass of one carbon-12 atom.
The mass of C-12 atom is taken as the standard to measure the mass of other atoms.
Thus, the atomic mass of magnesium is 24 amu and the atomic mass of calcium is 40 amu.