Outermost electronic configuration of a group 13 element, E , is 4 s 2 , 4 p 1 . The electronic configuration of an element of p-block period-five placed diagonally to element, E is:

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The element E is Ga and the diagonal element of 5 th period is Sn 50 having outer electronic configuration will be [ Kr ] 5 s 2 4 d 10 5 p 2 .

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