What is the Atomic Mass of Neon?

A)  19

B) 20

C)  21

D)  20.1797

Answer:

Option D) 20.1797  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 Neon,

• Number of Protons =  10
• Number of Neutrons = 10

Thus,

Atomic Mass of Neon = 10 + 10 = 20

Neon is a noble gas and its electronic configuration is, 2, 8. In absolute terms, the average atomic mass of  Neon is  20.1797 amu. It is calculated taking into account all the isotopes of Neon.

The main isotopes of Neon are:

• ₁₀Ne²⁰
• ₁₀Ne²¹
• ₁₀Ne²²

All the above listed isotopes are stable isotopes of Neon.