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The configuration of Cr atom is 3d^(5)4s...

The configuration of Cr atom is `3d^(5)4s^(1)` but not `3d^(4)4s^(2)` due to reason `R_(1)` and the configuration of Cu atom is `3d^(10)4s^(1)` but not `3d^(9)4s^(2)` due to reason `R_(2).R_(1) and R_(2)` are:

A

`R_(1):` The exchange energy of `3d^(5)4s^(1)`: is greater than that of `3d^(4)4s^(2)`
`R_(2):` The exchange energy of `3d^(10)4s^(1)` is greater than that of `3d^(9)4s^(2)`.

B

`R_(1)`: `3d^(5)4s^(1)` and `3d^(4)4s^(2)` have same exhange energy but `3d^(5)4s^(1)` is spheriaclly symmetrical.
`R_(2)`: `3d^(10)4s^(1)` is also shpherically symmetrical.

C

`R_(1)`: `3d^(5)4s^(1)` has grater exhange energy than `3d^(4)4s^(2)`.
`R_(2):3d^(10)4s^(1)` has spherical symmetry.

D

`R_(1):3d^(5)4s^(1)` has greater energy than `3d^(4)4s^(2)`.
`R_(2):3d^(10)4s^(1)` has greater energy than `3d^(9)4s^(2)`.

Text Solution

Verified by Experts

The correct Answer is:
C

`3d^(5)4s^(1)` is correct because it has greater exchange possibilities of unpaired electron.
`3d^(10)4s^(1)` is correct because `3d^(10)` orbitals are spherically symmetrical.
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Knowledge Check

  • Outer configuration of X is 3d^(5)4s^(1) . It belongs to group number

    A
    16
    B
    15
    C
    5
    D
    6

  • The element with electronic configuration 3d^(5)4s^(1) is

    A
    metalloid
    B
    non-metal
    C
    transition element
    D
    metal

  • Electronic configuration of M^(3+) is [Ar]3d^(10)4s^(2) , it belongs to

    A
    s-block
    B
    p-block
    C
    d-block
    D
    f-block

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