Q

# 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 $Mg (Z=12)$

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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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