a
Pauli's exclusion principle
b
Aufbau's principle
c
octet rule
d
Hund's rule
Explanation
Correct Option
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001shedy
1 year ago
Hund's rule.
Hund's rule states that when filling orbitals of equal energy, electrons occupy them singly and with parallel spins before pairing up. The given electron configuration 1s² 2s² 2p²x does not follow this rule, as the 2p orbitals should be filled with one electron each before pairing up.
option D is correct

