Question

Outermost electronic configuration of a group 13 element, E, is 4s² , 4p¹ . The electronic configuration of an element of p-block period-five placed diagonally to element, E is : 

(1) [Kr] 3d¹⁰ 4s² 4p² 

(2) [Ar] 3d¹⁰ 4s² 4p² 

(3) [Xe] 5d¹⁰ 6s² 6p² 

(4) [Kr] 4d¹⁰ 5s² 5p²

Answer 1

(4) [Kr] 4d¹⁰ 5s² 5p²

The element E is Ga and the diagonal element of 5^th period is ₅₀Sn having outer electronic configuration will be [Kr] 5s² 4d¹⁰ 5p² .