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Which of the following electron configur...

Which of the following electron configurations is correct for iron,(atomic number26)?

A

`1s ^2 2s^2 2p ^6 3s^2 3p^(6 ) 4s ^2 3d ^7`

B

` 1s^2 2s^2 2p ^6 3s ^2 3p ^6 4s ^2 3d^5 `

C

`1s^2 2s^2 2p^6 3s^2 3p ^6 3d^5`

D

` 1s^2 2^2 2p ^6 3s ^2 3p ^6 4s ^2 3d ^6 `

Text Solution

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The correct Answer is:
D
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AAKASH INSTITUTE ENGLISH-STRUCTURE OF ATOM-EXERCISE
  1. The de -Brogile wavelength associated with a matter particle is

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  2. Calculate the wavelength associated with an electron moving with a vel...

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  3. Probability density is given by

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  4. The possible values of magnetic quantum number for p-orbital are

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  5. The notation of orbital with n=5 and l=3 is

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  6. In multi-electron atom 4s-orbital is lower in energy than

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  7. Shape of an orbital is given by

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  8. Orientation of orbitals is given by

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  9. For n=4 , which one of the following values of l is not possible ?

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  10. If the uncertainties in position and momentum are equal, the uncertain...

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  11. Which one of the following orbitals is spherical in shape ?

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  12. The number of electrons present in 3d of Cu^(o+) is

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  13. The maximum number of electrons that can be accomoddated in d(x^(2)-y^...

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  14. The number of unpaired electrons in magnesium atom is

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  15. The correct sequence of energy of orbitals of multielectron species i...

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  16. The maximum number of unpaired electrons can present in p(x) orbital i...

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  17. The number of electrons present in 'M' shell of silicon is

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  18. The ion that is isoelectronic with CO is

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  19. Which of the following electron configurations is correct for iron,(at...

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

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