Question

Q. 1 Tell the valency.
Element
Symbol
Valency
HYDROGEN
HELIUM
Не
LITHIUM
BERYLLIUM
Be
BORON
G
3
CARBON
С C
NITROGEN
N
OXYGEN
O
FLUORINE
NEON
Ne​

Answer 1

Answer:

you can see from periodic chart.

Answer 2

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

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