Question

Given below are the electronic configurations of some elements:

(a) 2,8,3

(b) 2,8,18,5

(c) 2,8,7

(d) 2,8,18,8,1

(e) 2,8,2

(f) 2,5

(g) 2,8,18,8

Answer the following:

(d) which is an alkali metal?

Answer 1

The alkali metal in given electronic configurations is:

1. The alkali metals belong to the IA group. They are lithium, sodium, potassium, rubidium, cesium, and francium.
2. They have one electron in their outermost shell.
3. They are highly electropositive as they lose one valence electron very easily and attain a noble gas configuration.
4. The element having electronic configuration of 2, 8, 18, 8, 1 is an alkali metal as it has one valence electron.