Question

atomic number of an element x is 19
a. write down the electronic configuration of x
b. what will be the valency of x​

Answer 1

a). 2, 8,8,1 electronic configuration

b). valency will be +1

Answer 2

Given:

Atomic number = 19

Therefore, the element is K (potassium)

The Electronic configuration will be:

1s2 2s2 2p6 3s2 3p6 4s1

The valency is 1.