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The +3 ion of which one of the following has half filled 4f subshell ?

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answer is C.

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Detailed Solution

Lanthanum- [Xe]5d¹6s²

La³⁺−[Xe]

Luthenium- [Xe]4f¹45d¹6s²

Lu³⁺−[Xe]4f¹⁴

Gadolinium- [Xe]4f⁷5d¹6s²

Gd³⁺−[Xe]4f⁷

Actinium- [Rn]6d¹7s²

Ac³⁺−[Rn]

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