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Q.

Which electronic configuration for oxygen is correct according to Hund's rule of multiplicity ?

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a

1s2,  2s2,  2px2 2py1 2pz1

b

1s2,  2s2,  2px2 2py2 2pz0

c

1s2,  2s2,  2px3 2py1 2pz0

d

None of these

answer is A.

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Detailed Solution

Hund's rule states that pairing of electrons in the orbitals of a subshell (orbitals of equal energy) starts when each of them is singly filled.
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