Question

Derive the valency of Potassium , Lithium , Calcium , Boron

Answer 1

valency of potassium = 1
valency of lithium = 1
valency of calcium =2
valency of boron =3
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Answer 2

Valency the is the total numbers of electrons present in its outermost shell.

The total number of electrons in Potassium=19
2,8,8,1

Valency=1

The total number of electron in Lithium=3
2,1

Valency=1

The total number of electrons in calcium=20
2,8,8,2

Valency=2

The total number of electrons in Boron=5
2,3

Valency=3

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