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Structure of Atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom1 Mark
Question
Write electronic configuration of $\mathrm{Cu}^{2+}(29), \mathrm{Cr}^{3+}(24)$.
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Answer

$\mathbf{C u}^{2+}(\mathbf{2 9}): 1 s^2 ~2 s^2 ~2 p^6 ~3 s^2 ~3 p^6 ~4 s^0 ~3 d^9$
$\mathbf{C r}^{3+}(24): 1 s^2 ~2 s^2 ~2 p^6 ~3 s^2 ~3 p^6 ~4 s^0 ~3 d^3$

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