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20 October, 20:03

13 Which atom in the ground state has a stable electron configuration? (1) carbon (3) neon (2) magnesium (4) oxygen

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  1. 20 October, 20:43
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    The answer is (3) neon. It depends on the electron number of these atoms. If they have 8 electrons at the outer layer, it is stable. (For He, it only has 2 electrons at the first layer is also stable.)
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