MHT CET Chemistry question

In which of the Lanthanide elements, 5d elements does not shift to 4f orbitals?

Answer: (B)

Solution

La (4f0 5d1), Gd (4f7 5d1) and Lu (4f14 5d1) keep one electron in 5d because 4f is empty, half-filled or

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Question ID VK-074420