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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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Knowledge Check

  • The electronic configuration of Ag atom is

    A
    `[Kr]3d^(10)4s^(1)`
    B
    `[Xe]4f^(14)d^(10)6s^(1)`
    C
    `[Kr]4d^(10)5s^(1)`
    D
    `[Kr]4d^(9)5s^(2)`

  • The outer electronic configuration of Gd (Atomic No. 64) is

    A
    `4f^(3) 5d^(3) 6s^(2)`
    B
    `4f^(8) 5d^(0) 6s^(2)`
    C
    ` 4f^(4) 5d^(4) 6s^(2)`
    D
    ` 4f^(7) 5d^(1) 6s^(2)`

  • The electronic configuration of Gd^(2+) is :

    A
    `[Xe]4f^(7)`
    B
    `[Xe]4f^(7)5d^(1)`
    C
    `[Xe]4f^(8)`
    D
    `[Xe]4f^(8)5d^(1)6s^(2)`

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