Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table. Compare them with respect to: (i) the number of valence electrons in their atoms (ii) their valencies (iii) metallic character (iv) the sizes of their atoms (v) the formulae of their oxides (vi) the formulae of their chlorides.
X and Y belong to same period. X belongs to group ‘1’. Y belongs to group ‘2’. (i) Valence electron in X is 1 whereas valence electrons in Y are 2. (ii) The valency of X is 1 whereas valency of Y is 2. (iii) X is more metallic than Y because metallic character decreases on moving from left to right in a period. (iv) The size of X is more than Y because size of the atom decreases on moving from left to right in a period. (v) Oxide of X = X2O, Oxide of Y = YO (vi) Chloride of X = XCl, Chloride of Y = YCl2
