Question

atomic no. and valency
of h,hi li

Answer 1

h-v like ehejnedhhjd

Answer 2

Atomic Number (Z) of H (Hydrogen) is 1. Helium:- 2 and Lithium:- 3. You can learn the Periodic table for Atomic Numbers of elements. Valency is just as simple: H's 1+ as well as 1-. Helium's valency is 0, as it is a noble/inert gas. And lithium has the valency 1-.