Question

An element A atomic number 6 and mass number 12, element B having electronic configuration 2,8,8 and element C having protons 18 and neutrons 22 ,which one is an inert gas?​

Answer 1

Answer:

A is Nitrogen. Valency 3 or 5. Its non metal.

B is Argon. Valency  0

C is Aluminium. Valency is 3. Its metal.

D is Argon (noble gas/inert gas). Valency 0.

E is Kalium (Potassium). Valency 1. Its metal.

B and D is inert gas.