Question

Give the valency of first twenty elements.

Answer 1

Answer:

helium,hydrogen,lithium,berylion,boron,carbon,nitrogen,oxygen,fluorine,neon,

sodium,magnesium,aluminum,silicon,phosphorus,sulphur,chlorine,argon,

potasium  and calcium

Answer 2

Element Symbol Atomic Number Valency

Hydrogen - H 1 1

Helium He 2 0

Lithium Li 3 1

Beryllium Be 4 2

Boron B 5 3

Carbon C 6 4

Nitrogen N 7 3

Oxygen O 8 2

Fluorine F 9 1

Neon Ne 10 0

Sodium Na 11 1

Magnesium Mg 12 2

Aluminum Al 13 3

Silicon Si 14 4

Phosphorus P 15 3

Sulphur S 16 2

Chlorine Cl 17 1

Argon Ar 18 0

Potassium K 19 1

Calcium Ca 20 2

hope it helps you.