Question

68. Two elements ‘A’ and ‘B’ belong to group 1 and 2 respectively in the same period.

Compare them with respect to :–

(a) Number of valence electrons. (b) Valency

(c) Metallic character (d) Size of atom

(e) Formulae of their oxides​

Answer 1

Answer:

) The valence number of electrons in A is 1 and in B is 2.

b) The valency of the element is determined by the number of electrons in the outermost shell . Thus, the valency of element A is 1 and B is 2.

c) Element A is more metallic than B.

d) The size of element A is more than B.

e) The formulae of oxide of element A is A 2.

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