What is the Atomic Mass of Oxygen?

Atomic Mass of Oxygen is                   .

A) 16

B) 17

C) 15

D) 14

Answer: The atomic mass of Oxygen is 16 amu. Therefore, the correct option is A.

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 Oxygen,

• Number of Protons = 8
• Number of Neutrons = 8

Thus,

Atomic Mass of Oxygen = 8 + 8 = 16

In absolute terms, the average atomic mass of oxygen is 15.99994 amu. It is calculated taking into account all the isotopes of oxygen.