Atomic Mass of Boron is                .

A)  10.81

B)  10.04

C)  11.42

D)  14.81

Answer:

Option A) 10.81 is correct.

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 Boron,

• Number of Protons =  5
• Number of Neutrons =  6

Thus, 

Atomic Mass of Boron =  5 + 6 = 11

In absolute terms, the average atomic mass of Boron is 10.81 amu. It is calculated taking into account all the isotopes of Boron.

It has mainly two stable isotopes,

• ₅B¹⁰
• ₅B¹¹