1. For the ion Fe3+ what is the electron configuration and electron atrangement?

Question

please explain... i do not understand...

2.
F- +. Br2---->

Br- + Cl2----->

Answer 1

1.
26Fe = 1s2 2s2 2p6 3s2 3p6 3d6 4s2
To make the 3+ ion remove the two 4s and one of the 6d electrons.
26Fe^3+ = 1s2 2s2 2p6 3s2 3p6 3d5

2.
F^- + Br2 ==> no reaction
2Br^- + Cl2 ==> 2Cl^- + Br2

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