Q. 94.5( 4 Votes )

Two elements 'A'

Answer :

(a) Electronic configuration of A = 2, 8, 2

Electronic configuration of B = 2, 8, 3


(b) Along a period the atomic size of elements decreases. Thus element A has a higher size than B.


(c) Along a period due to increase in effective nuclear charge the tendency to loss electrons decreases, thus A has more metallic character.


(d) Valency of an O atom is -2. Hence formula is A2 O2


Valance electrons B atom is 3. Hence formula is B2O3


(e) Along a period the metallic character of elements decreases. A is thus more metallic.


(f) Valency of a Cl atom is -1.


Number of valance electrons in A=2 hence ACI2


Number of valance electrons in B=2 hence BCI3



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