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Aufbau principle is obeyed in which of the following electronic configurations:
(1) 1s2 2s2 2p6
(2) 1s2 3p6 3s2
(3) 1s2 3s2 3p6
(4) 1s2 2s2 3s2
ans: 1s2 2s2 2p6
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