MHT CET 2022 Chemistry question
What is the number of unpaired electrons present in f-orbital at +3 oxidation state of Lu (Z = 71)?
Answer: (A)
Solution
Lutetium (Z = 71) has the configuration . Forming Lu removes the 5d and the two 6s electrons, giving . The seven 4f orbitals are all completely filled (14 electrons, all
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