JEE · NEET Previous Year Question
The pair of lanthanides in which both elements have high third-ionization energy is:
Topic: JEE PYQ
Answer: C. Full step-by-step solution below.
- ADy,Gd
- BLu,Yb
- CEu,Yb
- DEu,Gd
Correct answer: C
Solution
(c)Europium has an atomic number of 63 and a stable electronic configuration of [Xe] .
Ytterbium, on the other hand, has an atomic number of 70 and a stable electronic configuration of [Xe] 4f .
Both have high 3 ionisation energy due to half filled & fully filled configuration respectively.
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