What is the correct electron configuration of ?

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

Problem

What is the correct electron configuration of

\text{Ni}^{2+}

? (1)

1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,4s^2\,4p^6\,3d^2

(2)

1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,4s^2\,3d^6

(3)

1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,3d^{10}

(4)

1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,3d^8

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