Question

The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all –
(a) halogens (b) noble gases
(c) noble metals (d) light metals

Answer 1

(b) Noble gases

The answer can also be Inert Gases

Answer 2

(b) noble gases

Explanation:

Atomic number 2, 10, 18, 36, 54 are Helium, Neon, Argon, Krypton, Xenon, Radon...  

An inert gas is a gas which does not undergo any chemical reactions under a set of given conditions. They are also called as noble gas. He,Ne and Ar belong to Group 18 which is the group containing noble gases. They have completely filled outer shells and thus 0 valency. So they do not undergo chemical reactions which makes them inert.

Option B is the answer.