**The electronic configuration of elements x and y are:**

x (At. no. 36) = 1s^{2} , 2s^{2}2p^{6} , 3s^{2}3p^{6}3d^{10} , 4s^{2}4p^{6}.

y (At. no. 58) = 1s^{2} , 2s^{2}2p^{6},3s^{2}3p^{6} , 3d^{10} , 4s^{2}4p^{6} , 5s^{2}4^{10}5p^{6} , 6s^{2}5d^{1}4f^{1 }.

**(i)** The element x belongs to 18th group, lies in the 4th period and belongs to p-block of elements. The element y belongs to lanthanoids, lies in the 6th period and belongs to f-block of elements.

**(ii) **The element x is a noble gas (Kr] and y is [Ce] is inner transition element. They are not representative elements.