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 formula of their oxides.
(vi) the formula of their chlorides.
(i) The number of valence electrons in element X is 1 while in element Y is 2.
(ii) The valency of element X is 1 and that of element Y is 2.
(iii) Element X is more metallic than element Y.
(iv) The size of atom X is more than that of atom Y.
(v) The formula of oxide of element X is X^O and that of element Y is YO.
(iv) The formula of chloride of element X is XC1 and that of element Y is YC12.