Question

Three element A,B and C have 3,4 and 2 electron respectively in their outermost shell.Give the group number to which they are belong in Modern periodic table,also give their valencies

Answer 1

Answer:

# Valency-

It's the tendency of the atom to gain or lose free electrons.

◆ Answer-

(A) For element A -

Electrons in outermost shell = 3

Group number = Gr. 13

Valency = +3

(B) For element B -

Electrons in outermost shell = 4

Group number = Gr. 14

Valency = +4, -4

(C) For element C -

Electrons in outermost shell = 2

Group number = Gr. 2

Valency = +2

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