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  4. Which of the following has maximum unpaired electrons?

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Q. Which of the following has maximum unpaired electrons?

J & K CETJ & K CET 2002The d-and f-Block Elements

Solution:

$Sc (Z =21):[A r]^{18} 4 s^{2} 3 d^{1}$ (1 unpaired electron)
$Cr (Z =24):[A r]^{18} 4 s^{1} 3 d^{5}$ (6 unpaired electrons)
$Mn (Z =25):[A r]^{18} 4 s^{2} 3 d^{5}$ (5 unpaired electrons)
$Fe (Z =26): [A r]^{18} 4 s^{2} 3 d^{6}$ (4 unpaired electrons)
Chromium has maximum number of unpaired electrons