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03-01-2020
Chemistry

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Of the atoms listed below, which one will have at least one electron in its d orbital?

A. Mg
B. K
C. S
D. Cr
E. none of the above

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dsdrajlin dsdrajlin

03-01-2020

Answer:

D. Cr

Explanation:

In order to determine which atom has at least one electron in its d orbital, we have to write their theoretical electron configurations.

₁₂Mg 1s² 2s² 2p⁶ 3s²

₁₉K 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

₁₆S 1s² 2s² 2p⁶ 3s² 3p⁴

₂₄Cr 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁴

Cr has 4 electrons in d orbitals. Cr belongs to the d-block in the periodic table.

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