Question

An element X belongs to the 3rd period and 1st group of the periodic table. What is the number of valence electrons in its atom?

Answer 1

Answer:

Explanation:

the no of valency electrons in NA is 1

Answer 2

The element 'X' has one valence electron.

• Groups in the periodic table decide the number of valence electrons in the atom of an element. An element in group 1 will have one valence electron.
• The periods decide the number of shells in the atom of an element. The element in period 3 will have 3 shells.
• The electronic configuration of element 'X' will hence be 2,8,1. Its outermost M shell will have a single valence electron.