A transition element containing only one electron in $4 s$ -orbital is:

_{21} S e

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_{23} M n

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_{26} F e

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_{29} C u

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Solution

The correct option is C $_{29} C u$
$_{29} C u$ has the electronic structure of $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} 3 d^{10}$ . One electron moves from the 4s-orbital to attain a more stable state with completely filled d orbital.

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Similar questions

For the four successive transition elements (Cr, Mn, Fe and Co), what is the order of stability of their +2 states?

(At. Nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

(i) V

= 23

(i i) C r

= 24

(i i i) M n

= 25

(i v) C u

= 29

(v) Z n

= 30

4 s

T i = 22, V = 23, C r = 24, M n = 25

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