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The rule that explain the reason for chr...

The rule that explain the reason for chromium to have `[Ar]3d^(5)``4s^(1)` configuration instead of `[Ar]3d^(4),4s^(2)` is

A

Pauli's exclusion principle

B

Aufbau principle

C

more exchange energy

D

Heisenberg's principle

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Verified by Experts

The correct Answer is:
C
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(A) : The electronic configuration of Cr is [Ar]3d^(5)4s^(1) but not [Ar]3d^(4)4s^(2) (R) : Lowering energy with configuration [Ar]3d^(5) 4s^(1) is more than that with configuration [Ar]3d^(4)4s^(2)

(A) : The electronic configuration of Cr is [Ar]3d^(5) 4s^(1) but not [Ar]3d^(4) 4s^(2) (R) : Lowering energy with configuration [Ar]3d^(5)4s^(1) is more than that with configuration [A]3d^(4)4s^(2)

Transition elements with 4s^(1) configuration are:

The configuration [Ar]3d^(5)4s^(1) in the first excited states exists for

Why is Cr^(2+) reducing and Mn^(3+) oxidising when both have d^(4) configuration ?

Explain why the valance electronic configuration of Cr andCu are written as 3d^5 4S^(1) and 3d^(10) 4s^(1) instead of 3d^4 4s^2 and 3d^9 4s^2 ?

What may be the stable oxidation state of the transition element with the following d electron configurations in the ground state of their atoms : 3d^(3) 3d^(5) 3d^(8) and 3d^(4) ?

Why is Cr^(2+) acts as reductant and Mn^(3+) as oxidant eventhough both have d^4 configuration ?

To which block does the element with valence configuration 3d^(10) 4s^2 belongs

AAKASH SERIES-ATOMIC STRUCTURE-Objective exercise - 1
  1. a) An orbital can hold only two electrons b) An orbital must have e...

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  2. Which of the following electronic configuration corresponds to an iner...

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  3. The rule that explain the reason for chromium to have [Ar]3d^(5)4s^(1)...

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  4. Which of the following configuration is not possible ?

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  5. Which of the following ions is not isoelectronic with O^(2-)

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  6. Number of valence electrons in carbon is

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  7. The number of unpaired electrons in Fe^(3+) ion are

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  8. The number of unpaired electrons in 1s^(2) 2s^(2) 2p^(3) is

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  9. Bohr's basic idea of discrete energy levels in atorns and the of Photo...

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  10. The number of d-electrons retained in Fe^(3+) (At. No. of Fe = 26) ion...

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  11. Which of the following is the correct electronic configuration of Fe^(...

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  12. The configuration of chromium atom in ground state is

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  13. The number of unpaired electrons in 1s^(2)2s^(2)2p^(3) is

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  14. Number of unpaired electrons in the electronic configuration 1s^(2)2^(...

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  15. Which of the following is not a fundamental particle ?

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  16. A neutral atom (At.no. gt 1) has

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  17. The study of discharge of electricity through gases led to the discove...

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  18. Electron is a particle having a

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  19. The value of e/m for an electron is

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  20. Charge of electron is

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