Which of the following ions has the electron configuration ?

CHEMISTRY · Single correct · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties

Problem

Which of the following ions has the electron configuration

[\text{Ar}]\,3d^{8}

? (a)

\text{Co}^{+}

(b)

\text{Fe}^{2+}

(c)

\text{Ni}^{2+}

(d)

\text{Ni}^{+}

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