Two elements X and Y belong to group 1 and 2 respectively in the same period of the periodic table. Compare these elements with respect to :
(i) number of electrons in their outermost orbit
(ii) their valencies
(iii) metallic character
(iv) their atomic size
(v) formula of their chlorides
(vii) formula of their sulphates.

Explanation

(i) Number of electrons in the outermost orbit of
X = 1 and Y = 2.
(ii) Valency of X = 1 and Y =2.
(iii) Metal X is more metallic than Y.
(iv) Atomic size of X is bigger than that of Y.
(v) Chloride `XCl,YCl_(2)`
(vi) Sulphate `X_(2)SO_(4),YSO_(4)`