Question

Which of the following has maximum unpaired electrons?

• A. Scandium
• B. Chromium
• C. Manganese
• D. Iron

Answer 1

Answer: (B)

Chromium

Answer 2

$Sc (Z =21):[A r]^{18} 4 s^{2} 3 d^{1}$ (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