UPSC Combined Geo-Scientist, Mains · 2025 · Mains Paper I
Q10(c). Electronic configuration and magnetic moment of La³⁺, Gd³⁺, Lu³⁺
Question
Write down the electronic configuration for La³⁺, Gd³⁺ and Lu³⁺ and calculate the magnetic moment for those electronic configurations.
Answer in brief
La³⁺ [Xe]4f⁰: 0 BM; Gd³⁺ [Xe]4f⁷: 7.94 BM; Lu³⁺ [Xe]4f¹⁴: 0 BM.
Part of VKC Basic
Read the key points and the full model answer with VKC Basic
VKC Basic (₹999 for 6 months) opens every solved answer, the notes, the handbook and the daily answer archive. Every Mains test series includes it.
The full model answer
As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.
The handwritten model answer pages open with the VKC plan.
Coverslanthanide magnetic momentLandé g factorgadolinium(III)electronic configuration of lanthanidesterm symbol
All parts of Question 10
- 10(a) Metal-ion indicators and their requisites10 marks
- 10(b) Masking and demasking in EDTA titrations10 marks
- 10(c) Electronic configuration and magnetic moment of La³⁺, Gd³⁺, Lu³⁺10 marks