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.

Two elements X and Y belong to group 1 and 2 respectively in the same

1.	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.
Answer» Solution :(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)`