The neutral atom of element X has the ground-state electron configuration

CHEMISTRY · Single correct · A Level · Chemistry · Atomic structure · Atomic structure

Problem

[\text{Ar}]\,4s^{1}\,3d^{5}

. An ion of X has the configuration

[\text{Ar}]\,3d^{5}

. Which of the following is the correct symbol for this ion? (a)

\text{Fe}^{3+}

(b)

\text{Cr}^{2+}

(c)

\text{Cr}^{+}

(d)

\text{Mn}^{2+}