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Assertion : The outer electronic config...

Assertion : The outer electronic configuration of Cr and Cu are `3d^(5) 4s^(1) ` and `3d^(10) 4s^(1)` respectively .
Reason : Electrons are filled in orbitals in order of increasing energies given by (n+l) rule.

A

if both assertion and reason are correct and reason is correct explanation for assertion .

B

If both assertion and reason are correct but reason in not correct explanation for assertion.

C

If assertion is correct but reason is incorrect.

D

If both assertion and reason are incorrect.

Text Solution

Verified by Experts

The correct Answer is:
B
Correct explanation. This is because completley filled and half-filled electronic configurations impart extra stability due to symmetrical distribution of electrons and more exchange energy.
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Knowledge Check

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

    A
    s-block element
    B
    transition element
    C
    lanthanide element
    D
    actinide element

  • The outer electronic configuration of Ag is 4d^10 5s^1 , it belongs to

    A
    5th period, group 4
    B
    4th period, group 5
    C
    5th period, group 11
    D
    4th period, group 11

  • The element with electronic configuration 3d 4s is

    A
    Metalloid
    B
    Non-metal
    C
    Tansition metal
    D
    Noble gas

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

    The ground state electronic configuration of Cu(29) is [Ar]3d^(10) 4s^(1) and not [Ar]3d^(0)4s^(2) . This is indicated by the fact that

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