Question

1) Write three atomic species of Hydrogen.
2) Write electronic configuration of the following:
Chlorine, Argon, Potassium, Iron, Magnesium,Aluminium

Answer 1

Protium
Deuterium
Tritium

Chlorine - 2,8,7
Argon- 2,8,8
Potassium- 2,8,8,1
Magnesium- 2,8,2
Aluminium- 2,8,3

Iron is a transition element so it's electronic configuration is not fixed.

Answer 2

electronic configuration of CL is 2,8,7
electronic configuration of argon is 2,8,8
e.c of iron is 2,8,18,8
e. c of magnesium is 2,8,2
e. c of al=2,8,3