What is the Atomic Mass of Lithium?

Atomic Mass of  Lithium is  .

A) 6

B) 5

C) 8

D) 7

Answer:

Option D) 7 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 Lithium,

• Number of Protons = 3
• Number of Neutrons = 4

Thus, 

Atomic Mass of  Lithium = 4 + 3 = 7

Lithium is the most electropositive element in the periodic table. In absolute terms, the average atomic mass of Lithium is 6.941 amu. It is calculated taking into account all the isotopes of Lithium.

The main isotopes of Lithium are,

• ⁷Li
• ⁶Li