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The electronic configuration of Eu (Atom...

The electronic configuration of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are:

A

`[Xe]4f^(7)6s^(2),[Xe]4f^(7)5d^(1)6s^(2) and [Xe]4f^(9)6s^(2)`

B

`[Xe]4f^(7)6s^(2),[Xe]4f^(8)6s^(2) and [Xe]4f^(8)5d^(1)6s^(2)`

C

`[Xe]4f^(6)5d^(1)6s^(2),[Xe]4f^(7)5d^(1)6s^(2) and [Xe]4f^(9)6s^(2)`

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
`""_(63)Eu to [Xe]4f^(7)6s^(2)` `""_(64)Gd to [Xe]4f^(7)5d^(1)6s^(2)`
`""_(65)Tb to [Xe]4f^(9)5d^(0)6s^(2)`
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