1.

Gadolinium belongs to 4f series. It's atomic number is 64. Which of the following is the correct electronic configurationof gadolinium ?

Answer»

`[XE]4F^7 5d^1 6s^2`
`[Xe]4f^6 5d^2 6s^2`
`[Xe]4f^8 6d^2`
`[Xe]4f^9 5s^1`

Solution :`""_(64)Gd : [Xe]^(54) 4f^7 5d^1 6s^2 ` (DUE to GREATER stability of half- filled 4f subshell).


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