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23 January, 06:58

Calcium chloride contains calcium and chloride ions. write the ground-state electron configuration for the chlorine ion.

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  1. 23 January, 07:11
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    The electron configuration of an atom of Chlorine Cl (neutral Chlorine) is:

    1s2 2s2 2p6 3s2 3p5

    Now if the Chlorine becomes an ion, it becomes Cl-. So we can see that 1 electron is added therefore the new electron configuration is:

    1s2 2s2 2p6 3s2 3p6
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