1.

Gadoliniumbelongs to 4f series. Its atomic number is 64 . Which of the following is the correct electronic configuration of gadolinium ?

Answer»

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

Solution :`. _(64) Gd= [Xe]^(54)4f^(7) 5d^(1) 6s^(2)` ( due to extra stability of half- filled4f SUBSHELL)


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