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Which one of the following configuration represents a noble gas:
(1) 1s2, 2s2, 2p6, 3s2,
(2)1s2, 2s2, 2p6, 3s1
(3) 1s2, 2s2, 2p6,
(4)1s2, 2s2, sp6, 3s2, 3p6, 4s2
Ans: 1s2, 2s2, 2p6,
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