Question

Write on the important elements with their symbols atomic no. And atomic mass in whole no.

Answer 1

Oxygen (O)

atomic no :-8

atomic mass :-~16

Hydrogen (H)

atomic no :-1

atomic mass :-~1

Carbon (C)

atomic no :-6

atomic mass :-~12

Nitrogen(N)

atomic no :-7

atomic mass :-~14