Question

The ' $f$ ' orbitals are half and completely filled, respectively in lanthanide ions
(Given: Atomic no. $Eu,63;Sm,62;Tm,69;Tb,65;Yb,70;Dy,66$]

• A. $E{u}^{2+}$ and $T{m}^{2+}$
• B. $S{m}^{2+}$ and $T{m}^{3+}$
• C. $T{b}^{4+}$ and $Y{b}^{2+}$
• D. $D{y}^{3+}$ and $Y{b}^{3+}$

Answer 1

Answer: (C)

$Tb\to 4f^{9}6s^2$
$T{b}^{+4}\to 4f^7$
$Yb\to 4f^{14}6s^2$
$Y{b}^{+2}\to 4f^{14}$