JEE Main20249 Apr 2024Morning ShiftChemistryd and f Block ElementsActual

Number of colourless lanthanoid ions among the following is ________ ( Eu ³⁺, Lu ³⁺, Nd ³⁺, La ³⁺, Sm ³⁺ )

Correct answer

Step-by-step solution

aligned & La ⁺³-[ Xe ] 4 f ^0 & Nd ⁺³-[ Xe ] 4 f ^3 & Sm ⁺³-[ Xe ] 4 f ^5 & Eu ⁺³-[ Xe ] 4 f ^6 & Lu ⁺³-[ Xe ] 4 f ¹⁴ aligned La ⁺³ and Lu ⁺³ do not show any colour because no unpaired electron is present.

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