Atomic Mass of  Potassium is                   .

A) 38

B) 39

C) 40

D) 41

Answer:

Option B) 39 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 Potassium,

• Number of Protons = 19
• Number of Neutrons = 20

Thus,

Atomic Mass of Potassium(K) = 19 + 20 = 39

In absolute terms, the average atomic mass of Potassium is 39.0983 amu. It is calculated taking into account all the isotopes of Potassium.