A transition element has an electronic configuration such that 4s orbital has only one electron. Which of the following is correct?

The element is

M g

and contains one electron in each of its 3d orbital

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The element is

M g

and contains an empty 3d orbital

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The element if

C r

and contains one electron in each of its 3d orbital

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None of these

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Solution

The correct option is C The element if $C r$ and contains one electron in each of its 3d orbital
The electron configuration of Chromium $(C r)$ is $[A r] {3 d}^{5} 4 s^{1}$
Electron configuration of Magnesium $(M g)$ is $[N e] 3 s^{2}$

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4 s

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} 4 s^{2}

3 d

{1 s}^{2} {2 s}^{2} {2 p}^{6} {3 s}^{2} {3 p}^{6} {3 d}^{3} {4 s}^{2}

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