Question

valency, atomic number and symbol of first 3 elements in periodic table

Answer 1

valency of hydrogen = 1
atomic no of hydrogen = 1
symbol of hydrogen = H
valency of helium = 2
atomic no of helium = 2
symbol of helium = He
valency of lithium = 1
atomic no of lithium = 3
symbol of lithium = Li

Answer 2

hydrogen atomic number - 1
                 valency - 1
                 symbol - H
helium atomic number - 2
            valency - 0
            Symbol - He
lithium atomic number - 3
            valency - 1
             symbol - Li