Question

write the names and valencies of the elements in 3rd row​

Answer 1

VALENCY OF FIRST 20 ELEMENTS WITH THEIR SYMBOL

Hydrogen[H]-valency- 1

Helium[He]-valency-0[noble gas]

Lithium[Li]-valency-1

Beryllium[Be]-valency-2

Boron[B]-valency-3

Carbon[C]-valency-4[it is a tetravalent element]

Nitrogen[N]-valency-3

Oxygen[O]-valency-2

Fluorine[F]-valency-1

Neon[Ne]-valency-0[noble gas]

Sodium[Na]-valency-1

Magnesium[Mg]-valency-2

Aluminium[Al]-valency-3

Silicon[Si]-valency-4[metalloid]/semi conductor

Phosphorus[P]-valency-3

Sulphur[S]-valency-2

Chlorine[Cl]-valency-1

Argon[Ar]-valency-0[noble gas]

Potassium[K]-valency-1

Calcium[Ca]-valency-2

Answer 2

Answer:

Na _ 1

Mg _ 2

Al _ 3

Si _ 4

P _ 3

S _ 6

Cl _ 1

Ar _ 0