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Aufbau, Pauli and Hund's rule, electronic configuration, half-filled/filled stability

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Every question from past board papers on Aufbau, Pauli and Hund's rule, electronic configuration, half-filled/filled stability, newest paper first. Open any question for its full worked answer.

NEET UG 2019 question paper (official, booklet P1)

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  1. 4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is :

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