Pair of lanthanide ions which show significant deviation between the experimental and calculated magnetic… · ABC26IN0174
Subject: Inorganic Chemistry · Chapter: Lanthanides and Actinides · Topic: Lanthanide Contraction · Exam: CSIR NET 2019 · Marks: 2 · Difficulty: Hard
Pair of lanthanide ions which show significant deviation between the experimental and calculated magnetic moments, considering contribution from the ground state only
(a)Gd and Lu
(b)Sm and Th
(c)Eu and Tb
(d)Sm and Eu
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.
Explanation
The configurations and magnetic moment are M+3 fn µ observed µ calculated Gd+3 4f 7 7.97 7.94 Lu+3 4f 14 0 0 Tb+3 4f 8 9.8 9.7 Sm+3 4f 5 1.64 0.85 Eu+3 4f 6 3.36 0 •Gd+3 (f7) and Lu+3 (f14) follow spin only formula µ = 7 𝑛(𝑛 + 2) •While for remaining µ(eff) = g 7 J(J + 1) is valid [CSIR 2020]
Explanation as extracted from the printed page; notation may be imperfect.