What is the Atomic Mass of Silicon?

Atomic Mass of Silicon is  .

A) 28

B) 29

C) 27

D) 30

Answer: The atomic mass of Silicon is 28 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 Silicon,

Number of Protons = 14
Number of Neutrons = 14

Thus,

Atomic Mass of Silicon = 14 + 14 = 28

In absolute terms, the average atomic mass of Silicon is 28.0891 amu. It is calculated taking into account all the isotopes of Silicon.

The three naturally occurring isotopes of silicon are,

• ²⁸Si
• ²⁹Si
• ³⁰Si