Home
Class 12
CHEMISTRY
Explain why electronic configurations of...

Explain why electronic configurations of lanthanoids are not known with certainty.

Text Solution

Verified by Experts

In the lanthanoids, the outermost 6s-subshell remains filled with two electrons `(6s^(2))`. But due to very small difference in energy between 4f and 5d-orbitals, the incoming electron may enter either of these two orbitals. This is responsible for causing irregularities in the electronic configurations of lanthanoids. Further irregularities are also related to the extraordinary stabilities of `f^(0), f^(7)` and `f^(14)` electronic configurations. Hence electronic configurations of lanthanoids are not known with certainty. As an illustration, it is really difficult to predict whether the configuration of Ce (Z = 58) is `[Xe]4f^(2)5d^(0)6s^(2)` or `[Xe]4f^(1)5d^(1)6s^(2)`.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • D - AND F - BLOCK ELEMENTS

    CHHAYA PUBLICATION|Exercise SOLVED WBCHSE SCANNER|22 Videos

  • D - AND F - BLOCK ELEMENTS

    CHHAYA PUBLICATION|Exercise SOLVED CBSE SCANNER|51 Videos

  • D - AND F - BLOCK ELEMENTS

    CHHAYA PUBLICATION|Exercise QUESTION - ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE)|38 Videos

  • COORDINATION COMPOUNDS OR COMPLEX COMPOUNDS

    CHHAYA PUBLICATION|Exercise PRACTICE SET 21|2 Videos

  • ELECTROCHEMISTRY

    CHHAYA PUBLICATION|Exercise PRACTICE SET 4(Answer the following questions)|14 Videos

Similar Questions

Explore conceptually related problems

The electronic configurations of actinides are not known with certainty. Explain.

The electronic configuration of Lanthanides is

Knowledge Check

  • The electronic configuration of Cu is

    A
    `[Ne] 3s^2 3p^6 3d^9 4s^2`
    B
    `[Ne] 3s^2 3p^6 3d^10 4s^1`
    C
    `[Ne] 3s^2 3p^6 3d^3 4s^2 4p^6`
    D
    `[Ne] 3s^2 3p^6 3d^5 4s^2 4p^4`

  • The electronic configuration of Cu is-

    A
    `[Ne]3s^(2)3p^(6)3d^(9)4s^(2)`
    B
    `[Ne]3s^(2)3p^(6)3d^(10)4s^(1)`
    C
    `[Ne]3s^(2)3p^(6)3d^(3)4s^(2)4p^(6)`
    D
    `[Ne]3s^(2)3p^(6)3d^(5)4s^(2)4p^(4)`.

  • The electronic configuration of calcium atom is

    A
    2,2,8,8,
    B
    2,2,8,2
    C
    2,8,8,2
    D
    2,8,2,8

    • Similar Questions

    Explore conceptually related problems

    The electronic configuration of Actinides is

    The electronic configuration of chromium is

    The electronic configuration of Cu^(3+) is :

    The electronic configuration of Cu is -

    The electronic configuration of potassium is

    Home
    Profile