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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

Text Solution

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)

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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) ?

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AAKASH SERIES-ATOMIC STRUCTURE-Level - I (MAIN) (Exercise - V (Electronic configuration , Aufbau principle, Pauli.s Exclusion principle and Hund.s rule ))
  1. Which of the following configuration may represent the ground state of...

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  2. Electronic configuration of the element with atomic number 56 and mass...

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  3. (A) : The electronic configuration of boron cannot be 1s^(2)2s^(3) (...

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  4. The correct valence electronic configuration for Cu(Z=29) is

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  5. Which one of the following pairs of ions have the same electron config...

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  6. The (n+1) value for 4f sub shell is

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  7. The energy of the electron in the hydrogen atom depends on

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  8. After 3d-su level is completely filled the differentiating electron en...

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  9. The correct ground state electronic configuration of chromium atom is

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  10. The configuration 1s^(2)2s^(2)2p^(6)3s^(2)3p^(3) corresponds to

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  11. The configuration 1s^(2)2s^(1)2p(x)^(1)2p(y)^(1)2p(2)^(1) represents

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  12. The total number of .p. electrons present in phosphorous atom is

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  13. The valence electron configuration of an element with atomic number 23...

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  14. Mg^(2+) and Al^(3+) have same

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  15. The number of unpaired electrons in the valence shell of silicon is

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  16. (A) : AN orbital can.t have more than two electrons (R) : The first ...

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

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

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  19. Which of the following configuration is not possible ?

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

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