Which is most probably the ground state electron configuration for the iron(III) ion?
A) [Ar]4s23d3
B) [Ar]4s13d4
C) [Ar]4s03d33p3
D) [Ar]4s04p5
E) [Ar]4s03d5

Question

Quizplus · Accepted Answer

Iron(III) ion has lost three electrons, therefore its electron configuration would be [Ar]3d5. The closest noble gas to this configuration is argon, so we add it as a prefix to get [Ar]4s03d5. Option E is the closest match.

Which Is Most Probably the Ground State Electron Configuration for the Iron(III)