Easy
Which of the following electronic configurations is not possible according to Hund's rule?
- A$1s^2 \, 2s^2$
- B$1s^2 \, 2s^1$
- C$1s^2 \, 2s^2 \, 2p_x^1 \, 2p_y^1 \, 2p_z^1$
- D$1s^2 \, 2s^2 \, 2p_x^2$
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