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08-09-2020
Chemistry

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Give the electron configurations for the following ions: Al3+, Ba2+, Br- and O2-

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10-09-2020

Explanation:

Al3+ has 10 electrons. The electronic configuration is;

1s² 2s² 2p⁶

Ba2+ has 54 electrons. The electronic configuration is;

1s² 2s² 2p6 3s² 3p⁶ 3d10 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶

Br- has 37 electrons. The electronic configuration is;

1s² 2s² 2p6 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶

O2- has 10 electrons. The electronic configuration is;

1s² 2s² 2p⁶

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