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Tell me? - d and f Block Elements - NEET

The number of d-electrons in Fe^{2+}(Z=26) is not equal to the number of electrons in which one of th e following?

  • Option 1)

    p-electrons in cl (Z=17)

  • Option 2)

    d-electrons in Fe (Z=26))

  • Option 3)

    p-electrons in Ne (Z=10)

  • Option 4)

    s-electrons in Mg (Z=12)

 
Answers (1)
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Electronic Configuration -

The 'd' block elements follow the general configuration.(n-1)d^{1-10}(ns^{1-2})

-

 

 Electronic Config of    Fe_{2}^{+}  : Fe_{2}^{+} \left [ Ar \right ] 3d^{6}4s^{0}

no of d Electronic = 6

Electronic Config Of Cl : 1s^{2}\:2s^{2}\:2p^{6}\:3s^{2}\:3p^{5}

\therefore  no of p Electronic = 5+6 =11


Option 1)

p-electrons in cl (Z=17)

Correct

Option 2)

d-electrons in Fe (Z=26))

Incorrect

Option 3)

p-electrons in Ne (Z=10)

Incorrect

Option 4)

s-electrons in Mg (Z=12)

Incorrect

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