JEE Main · 2021 · 20 Jul 2021 · Shift 2 · p-Block Elements

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:

(A) $[Kr] 4 d^{10} 5 s^{2} 5 p^{2}$ ✓ Correct
(B) $[Kr] 3 d^{10} 4 s^{2} 4 p^{2}$
(C) $[Xe] 5 d^{10} 6 s^{2} 6 p^{2}$
(D) $[Ar] 3 d^{10} 4 s^{2} 4 p^{2}$

Answer: (A)

Solution

Element E with configuration

4 s^{2} 4 p^{1}

is Gallium (Ga) in group 13, period 4. The diagonal relationship in the periodic table means moving one period down and one group to the right. From Ga (group 13, period 4), the diagonally placed element in period 5 would be in group 14. This is Tin (Sn) with configuration

[Kr] 4 d^{10} 5 s^{2} 5 p^{2}

JEE Main · 2021 · 20 Jul 2021 · Shift 2 · Single correct option

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