Atomic Mass of Sodium is                   .

A) 21

B) 22

C) 23

D) 24

Answer: The atomic mass of Sodium is 23 amu. Therefore, the correct option is C.

Explanation:

Atomic Mass of any substance is the sum of the number of protons and the number of neutrons in the nucleus of that atom.

For Sodium,

• Number of Protons = 11
• Number of Neutrons = 12

Thus,

Atomic Mass of Sodium = 11 + 12 = 23

In absolute terms, the average atomic mass of sodium is 22.989769 amu. It is calculated taking into account all the isotopes of Sodium.