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
Answers
Periodic Table
Explanation:
Given: Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table.
(i) Valence electrons is the same as the group number. The number of valence electrons in element X = 1 and for valence electrons in element Y = 2.
(ii) The valency of element X is 1 and valency of Y is 2.
(iii) Element X is more metallic than element Y as metallic character decreases as we go from left to right in a periodic table.
(iv) The size of atom X is greater than the size of atom Y as atomic radii decreases as we go from left to right in a periodic table.
(v) Oxides of X will have the formula X2O while oxides of Y will have the formula YO based on their valency.
(iv) Chlorides of X will have the formula XCl while chlorides of Y will have the formula YCl2, again based on their valency.