Question

Valency of potassium ion is:

Answer 1

We can find the valence electron of an element using its atomic number , as potassium’s atomic number is 19

Thus , you can write its electronic configuration as follows : 2 , 8 , 8 , 1

Potassium ($K$) typically has 19 total electrons, 1 of which is in the outermost shell, and therefore 1 valence electron.

Answer is $1$