Question

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

Answer 1

Step-by-step 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