D-And F-Block Elements Ques 251

Question: The number of d-electrons in $ F{{e}^{2+}} $ (at no. of $ Fe=26 $ ) is not equal to that of the

[MNR 1994]

Options:

A) p - electrons in Ne (at. no. = 10)

B) s - electrons in $ Mg $ (at. no. = 12)

C) d - electrons in $ Fe $

D) p - electrons in $ C{{l}^{-}} $ (at. no. of $ Cl=17 $ )

Show Answer

Answer:

Correct Answer: D

Solution:

p-electrons in $ C{{l}^{-}} $ (atomic no. of $ Cl=17 $ ) $ C{{l}^{-}},\to ,1s^{2}2s^{2}2p^{6}3s^{2}3p^{6} $

$ F{{e}^{2+}},\to ,1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{6} $

In $ F{{e}^{+2}} $ total number of $ d{{e}^{-}}=6 $ which is not equal to $ p{{e}^{-}} $ in $ C{{l}^{-}}=12 $ .



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