Which of the following represents the electronic confilguration of a transition element?

# Which of the following represents the electronic confilguration of a transition element?

1. A

$1{\mathrm{s}}^{2},2{\mathrm{s}}^{2}{\mathrm{p}}^{6}.........{\mathrm{ns}}^{2}{\mathrm{p}}^{3}$

2. B

$1{\mathrm{s}}^{2},2{\mathrm{s}}^{2}{\mathrm{p}}^{6}.........{\mathrm{ns}}^{2}{\mathrm{p}}^{6}$

3. C

$1{\mathrm{s}}^{2},2{\mathrm{s}}^{2}{\mathrm{p}}^{6}.........{\mathrm{ns}}^{2}{\mathrm{p}}^{3}{\mathrm{d}}^{10},\left(\mathrm{n}+1\right){\mathrm{s}}^{2}{\mathrm{p}}^{1}$

4. D

$1{\mathrm{s}}^{2},2{\mathrm{s}}^{2}{\mathrm{p}}^{6}.........{\mathrm{ns}}^{2}{\mathrm{p}}^{6}{\mathrm{d}}^{3},\left(\mathrm{n}+1\right){\mathrm{s}}^{2}$

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### Solution:

$1{\mathrm{s}}^{2},2{\mathrm{s}}^{2},2{\mathrm{p}}^{6}.......{\mathrm{ns}}^{2}{\mathrm{p}}^{6}{\mathrm{d}}^{3},\text{ }\left(\mathrm{n}+1\right){\mathrm{s}}^{2}$ as last electron enters d-subshell.

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