Electronic configuration is not possible hund s rules, Chemistry

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Which of the following electronic configuration is not possible according to Hund's rule:

(1) 1s² 2s²

(2) 1s² 2s¹

(3) 1s²2s² 2p¹_x 2p_y¹y 2p¹_x

(4) 1s²2s² 2p²_x

(5) 1s² 2s² 2p²_x 2p¹_y 2p¹_z

Ans: 1s² 2s² 2p²_x

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