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(A) : The electronic configuration of bo...

(A) : The electronic configuration of boron cannot be `1s^(2)2s^(3)`
(R) : No two electrons in an atom can have the same set of all the four quantum numbers

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Boths

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Text Solution

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The correct Answer is:
A
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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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