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Question

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

A
1s22s22p2x 2p1y 2p1z
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B
1s22s22p2x 2p2y 2p0z
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C
1s22s12p2x 2p1y 2p2z
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D
1s12s22p2x 2p2y 2p1z
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Solution

The correct option is A 1s22s22p2x 2p1y 2p1z
Hund's rule states that pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital belonging to that subshell has one electron each.
In option (a), Hund's rule is satisfied whereas in other options either Hund's rule or Aufbau principle is violated.

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