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the secreenning constant of last electron of which element will ne maximum :

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the secreenning constant of last electron of which element will ne maximum :
A. 24
B. 18
C. 23
D. 22
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Correct Answer - b
`""_(24)Cr^(+5)implies (1s^(2))(2s^(2)2p^(6))(3s^(2)3p^(6))(3d^(1))`
` sigma=1xx(18)=18`
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