JEE MAIN - Chemistry (2022 - 27th June Evening Shift - No. 6)
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]
Eu2+ and Tm2+
Sm2+ and Tm3+
Tb4+ and Yb2+
Dy3+ and Yb3+
Explanation
Tb $$ \to $$ 4f9 6s2
Tb+4 $$ \to $$ 4f7
Yb $$ \to $$ 4f14 6s2
Yb+2 $$ \to $$ 4f14
Hence, the pair Tb+4 and Yb+2 have half filled and completely filled f subshells respectively.
Tb+4 $$ \to $$ 4f7
Yb $$ \to $$ 4f14 6s2
Yb+2 $$ \to $$ 4f14
Hence, the pair Tb+4 and Yb+2 have half filled and completely filled f subshells respectively.
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