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What is the Atomic Mass of Magnesium?

Atomic Mass of Magnesium is               .

A) 25

B) 23

C) 25

D) 24

Answer: The atomic mass of Magnesium is 24 amu. Therefore, the correct option is D.

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 Magnesium,



  • Number of Protons = 12
  • Number of Neutrons = 12

Thus,

Atomic mass of Magnesium = 12 + 12 = 24



In absolute terms, the average atomic mass of Magnesium is 24.31 amu. It is calculated taking into account all the isotopes of Magnesium.

There are three naturally occurring isotopes of magnesium which are listed below:

  • Mg-24
  • Mg-25
  • Mg-26
Article Tags :
Chemistry-MAQ
School Chemistry
School Learning
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