Which among the following elements possesses one electron in 4 s orbital in observed electronic configaration?

1. $\mathrm{V}(\mathrm{Z}=23)$
2. $\mathrm{Ni}(\mathrm{Z}=28)$
3. $\mathrm{Mn}(\mathrm{Z}=25)$
4. $\mathrm{Cu}(\mathrm{Z}=29)$

Solution

$=1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}, 4 s^{1}$

Asked in: MHT CET 2020 (20 Oct Shift 2)

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