1.

Which of the following is not the configuration of lanthanoid

Answer»

`[Xe]4f^(10).6s^(2)`
`[Xe]4f^(1)5d^(1).6s^(2)`
`[Xe]4f^(14)5d^(10)6s^(1)`
`[Xe]4f^(7)5d^(1)6s^(2)`

Answer :C


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