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Which of the following electronic configurations corresponds to Lu3+?

1. La3+: 5d1 6s2 = [Xe]
2. To3+: 19 e− = [Ar] 3d4 (Colour)
3. Lu3+: 68 e− = [Xe] 4f14
4. Sc3+: 18 e− = [Ar]

Correct answer: Lu3+: 68 e− = [Xe] 4f14

Solution

Lu3+ has 68 electrons, and its configuration is [Xe] 4f14, as it loses three electrons from 6s and 5d orbitals.

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