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Which of the following electronic config...

Which of the following electronic configuration is not possible? 

A

`1s^(2)2s^(2) 2p^(6)`

B

`1s^(2)2s^(2)2p^(7)`

C

`1s^(2)2s^(2)`

D

`1s^(2)2s^(2)2p^(5)`

Text Solution

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The correct Answer is:
B
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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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