Question

Find valency of following element

1. Helium
2. Magnesium ​

Answer 1

Answer:

Helium=0

Magnesium=2

hope it helps you.....

Answer 2

Explanation:

1. Helium

Valancy = 0

Reason = ♠️ No valance electron present

♠️Duplet is completed

Amtomic number - 2

Electronic configuration - 2

2 magnesium

Valancy= 2

Reason =♠️ belongs to group 2

♠️ Two electron in outermost shell

Atomic number - 12

Electronic configuration - 2,8,2