Chemistry - f-block Question with Solution | TestHub

Ion Configuration Unpaired Electron

${\mathrm{Tb}}^{2\oplus }$ $4{\mathrm{f}}^9$ 5

${\mathrm{Ce}}^{4\oplus }$ [Xe] 0

${\mathrm{Yb}}^{2\oplus }$ $4f^{14}$ 0

${\mathrm{Lu}}^{3\oplus }$ $4{\mathrm{f}}^{14}$ 0

${\mathrm{Pr}}^{2\oplus }$ $4f^3$ 3

${\mathrm{Nd}}^{2\oplus }$ $4f^3$ 4

${\mathrm{Pm}}^{2\oplus }$ $4f^5$ 5

${\mathrm{Sm}}^{2\oplus }$ $4f^6$ 6

${\mathrm{Gd}}^{3\oplus }$ $4f^7$ 7

${\mathrm{Ce}}^{4\oplus },{\mathrm{Yb}}^{2\oplus },{\mathrm{Lu}}^{3\oplus }$ are diamagnetic due to absence of unpaired electron