Question

Arrange the following in ascending order of their valency

Boron,Beryllium and Lithium.

• A. Boron,Beryllium and Lithium
• B. Beryllium,Boron and Lithium
• C. Lithium,Beryllium and Boron.
• D. None of these

Answer 1

The correct option is C

Lithium,Beryllium and Boron.

Boron:
It has 3 electrons in it's outermost orbit and can give 3 electrons inspite of gaining 5 electrons. So it's valency is 3.
Beryllium;
It has 2 electrons in the outermost orbit and can give 2 electrons inspite of gaining 6 electrons . So it's valency is 2.
Lithium:
It has 1 electron in the outermost orbit and can give 1 electron inspite of gaining 7 electrons . So it's valency is 1.