Problem: When forming cations, electrons are removed first from orbitals that are bigger rather than necessarily those with higher energy. Given this, what is the electron configuration of the cobaltic cation, Co3+? (A) [Ar] 4s2 3d7 (B) [Ar] 4s2 3d4 (C) [Ar] 3d5 (D) [Ar] 4s2 3d10 (E) [Ar] 3d6

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When forming cations, electrons are removed first from orbitals that are bigger rather than necessarily those with higher energy. Given this, what is the electron configuration of the cobaltic cation, Co3+?

(A) [Ar] 4s2 3d7

(B) [Ar] 4s2 3d4

(C) [Ar] 3d5

(D) [Ar] 4s2 3d10

(E) [Ar] 3d6

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