Question

Which of the following electronic configuration does not belong to same block as others:-
(1) [Xe]
$4 {f}^{14} 5 {d}^{10} 6 {s}^{2}$
(2) [Kr]
$4 {d}^{10} 5 {s}^{2}$
(3) [Kr]
$5 {s}^{2}$
(4) [Ar]
$3 {d}^{6} 4 {s}^{2}$
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Answer 1

Explanation:

xenon ... due to the presence of f orbitals.. it is different..