Two elements X and Y belong to group 1 and 2 respectively in the same period. Compare them with respect to:
(a) the number of valence electrons (b) valency (c) metallic character (d) size of the atoms (e) formulae of their oxides and chlorides.

Two elements X and Y belong to groups 1 and 2 respectively in the same period. Compare them with respect to (a) the number of electrons in the outermost shell, (b) the number of valence electrons , (c) metallic character, (d) size of the atoms and ( e) formulae of the oxdies , hydrides and chlorides.