1.

Atomic number ""_(64)Gd, ""_(66)Dy, ""_(69)Tm, ""_(71)Lu. which of the following does not have unpaired electron ?

Answer»

`Gd^(3+)`
`Dy^(3+)`
`TM^(3+)`
`Lu^(3+)`

Solution :We know that, `Gd ^(3+)` has `4F^(7)` configuration containing 7 UNPAIRED electrons. `Dy ^(3+)` has `4f ^(9)` congiguration, containing five unpaired electrons. `Tm^(3+)` has `4f ^(12)` configuration, containing two unpaired electrons. `Lu^(3+)` has `4f^(14)` configuration does not CONTAINS unpaired electrons.


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