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21 July, 06:15

Which atom in the ground state has the same electron configuration as a calcium ion, Ca2+, in the ground state? (1) Ar (2) K (3) Mg (4) Ne

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  1. 21 July, 08:14
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    The answer is (1) Ar. The electron configuration of calcium ion, Ca2 + is 2, 8, 8. The ground state of Ar atom also has electron configuration of 2, 8, 8. So the answer is (1).
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