Question

Define the term molecular mass . What is the valency of Neon ?

Answer 1

It is the average relative mass of its molecule as compared with that of an atop of C-12 Isotope whose mass is taken as 12 . 
Valency of neon is 0 as it is a noble gas .

Answer 2

The amount of a substance whose mass in grams is numerically equal to its molecular mass,it is called Gram Atomic Mass.

Valency of Neon is ⇒0 (Zero)