Question

number of protons present in some elements are; 7,12, 15, 19 and 20. Find its number of electrons, valency and name of the elements.​

Answer 1

Explanation:

Nitrogen, p=7,e=7,v=3

magnesium, p=12 e=12 v =2

potassium p=19 e=19 v= 1

calcium p=20 e=20 v =2