1.

The actual electron confuguration of La(Z=57) is ….

Answer»

`[Xe] 4F^(1)5d^(0)6s^(2)`
`[Xe] 4f^(3)`
`[Xe] 4f^(0)5d^(1)6s^(2)`
`[Xe] 4f^(0)5d^(3)`

Solution :`[Xe] 4f^(0)5d^(1)6s^(2)`


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