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Solution


Q.

The pair of lanthanides in which both elements have high third-ionization energy is:  [2023]
1 Dy, Gd  
2 Lu, Yb  
3 Eu, Yb  
4 Eu, Gd  

Ans.

(3)

Element Electronic configuration
Europium (Eu) [Xe] 4f76s2
Gadolinium (Gd) [Xe] 4f75d16s2
Dysprosium (Dy) [Xe] 4f106s2
Ytterbium (Yb) [Xe] 4f146s2
Lutetium (Lu) [Xe] 4f145d16s2

 

Eu+2 and Yb+2 have high IE due to half-filled and fully filled configuration.