Question

Two elements x and y have atomic numbers 36 and 58 respectively. On the basis of electronic configuration, predict the following:

(i) The group, period and block to which each element belongs.

(ii) Are they representative elements?

Answer 1

The electronic configuration of elements x and y are:

x (At. no. 36) = 1s² , 2s²2p⁶ , 3s²3p⁶3d¹⁰ , 4s²4p⁶.

y (At. no. 58) = 1s² , 2s²2p⁶,3s²3p⁶ , 3d¹⁰ , 4s²4p⁶ , 5s²4¹⁰5p⁶ , 6s²5d¹4f¹ .

(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.