Question

Which of the following correctly represent the electronic distribution in the Mg atom?

Options

• 3, 8, 1

• 2, 8, 2

• 1, 8, 3

• 8, 2, 2

Answer 1

2, 8, 2

Explanation - 

Atomic number and the number of electrons in magnesium atom is 12. So, electronic configuration is 2, 8, 2 (because 12 = 2 + 8 + 2).