Which of the following has the maximum number of unpaired $d$ -electrons?

{Z n}^{2 +}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

{F e}^{2 +}

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

{N i}^{3 +}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

{C u}^{+}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A ${F e}^{2 +}$
${F e}^{2 +}$ has the maximum number of unpaired $d$ -electrons.
$Z n (30) = [A r] 3 d^{10}, 4 s^{2}$

${Z n}^{2 +} = [A r] 3 d^{10} :$ No unpaired electron

$F e (26) = [A r] 3 d^{6}, 4 s^{2}$
${F e}^{2 +} = [A r] 3 d^{6} :$ Four unpaired electrons.
$N i (28) = [A r] 3 d^{8}, 4 s^{2}$
${N i}^{3 +} = [A r] 3 d^{7} :$ Three unpaired electrons.
$C u (29) = [A r] 3 d^{10}, 4 s^{1}$
${C u}^{+} = [A r] 3 d^{10} :$ No unpaired electrons.

Suggest Corrections