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Which electronic configuration for oxygen is correct according to Hund's rule of multiplicity:
(1) 1s2, 2s2, 2p2x, 2p1y, 2p1z
(2) 1s2, 2s2, 2p2x, 2p2y, 2p0z
(3) 1s2, 2s2, 2p3x, 2p1y, 2p0 z
(4) None of these
Ans: 1s2, 2s2, 2p2x, 2p1y, 2p1z
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