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In which of the following Aufbau princip...

In which of the following Aufbau principle is violated? 

A

B

C

D

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The correct Answer is:
B
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Electronic configuration of multielectron atoms can be written by the use of four quantum numbers and also by following certain principles. Pauli's exclusion principle suggests that maximum capacity of an atomic orbital is two. Auf bau principle suggests that the lower energy orbitals are filled first and hence stability can be attained. Hunds rule of maximum multiplicity suggests that pairing occurs with one electron. The arrangement of electrons in the space around the nucleus can be understood only after writing the electronic configuration. Thus writing electronic configuration is more important in the structure of an atom. Auf-bau principle is first violated for the element with atomic numbers

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AAKASH SERIES-ATOMIC STRUCTURE-Objective Exericse - 2A
  1. Given this set of quantum numbers for a multi electron atom 2, 0, 0, a...

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  2. Which one of the following pairs of atoms/ions have identical ground s...

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  3. How many 'd' electrons are present in Cr^(2+) ion?

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  4. The atomic nụmber of the element with the maximum number of unpaired 2...

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  5. The total number of electrons present in all the 's' orbitals, all the...

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  6. Which atom has as many 's' electrons as P-electrons

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  7. An element has 2 electrons in its K-shell. 8 electrons in L-shell, 13 ...

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  8. The electronic configuration 1s^(2)2s^(2)2p^(6)3s^(1)3p^(3)3d^(2) repr...

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  9. The atomic number of an element M is 20. How many electrons are presen...

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  10. Consider the ground state of Cr atom (Z = 24). The numbers of electron...

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  11. Which is the first element to have 4d-electron in its electronic confi...

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  12. In the ground state, an element has 13 electrons in its "M - shell". T...

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  13. (A) : The electronic configuration of Cr is [Ar]3d^(5)4s^(1) but not [...

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  14. The electrons identified by quantum number n and l are (I) n = 1, l ...

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  15. (A) : Fe^(3+) (g) is more stable than Fe^(2+) (g). (R) : Fe^(3+) (g)...

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  16. In which of the following Aufbau principle is violated?

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  17. Which of the following electronic configuration is not possible?

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  18. The configuration 1s^(2)2s^(2)2p^(5)3s^(1) shows

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  19. Which of the following has maximum unpaired d-electrons?

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  20. Consider the ground state of Cr atom (Z = 24). The numbers of electron...

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