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26 August, 13:00

Write electron configurations for the most stable ion formed by each of the elements Br, Cs, Sr, and O (when in stable ionic compounds).

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  1. 26 August, 15:18
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    Bromine belongs to group 7. It's most stable ion is the bromide, Br-.

    Electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

    Caesium belongs to group 1. It's most stable ion is Cs+

    Electronic configuration = 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6

    Strontium belongs to group 2. It's most stable ion is the Sr2+

    Electronic configuration = 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6

    Oxygen belongs to group 6, it's most stable ion is O2-

    Electronic configuration = 1s2 2s2 2p6
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