JEE Main 2022 · 27 Jun · Shift 2 · Chemistry Q69

ChemistrySingle correct+4 / -1Question 69 of 90

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]

\mathrm{Eu^{2+}}

and

\mathrm{Tm^{2+}}

\mathrm{Sm^{2+}}

and

\mathrm{Tm^{3+}}

\mathrm{Tb^{4+}}

and

\mathrm{Yb^{2+}}

\mathrm{Dy^{3+}}

and

\mathrm{Yb^{3+}}

Answer and worked solution

Official answer: C

f counts. $\mathrm{Tb^{4+}}$ : $4f^7$ (half filled). $\mathrm{Yb^{2+}}$ : $4f^{14}$ (full).

(C)

Topics:Lanthanoids Electronic configuration

JEE Main 2022 · 27 Jun · Shift 2, Chemistry question 69