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The elecronic configuration 1s^2 ,1s^2 2...

The elecronic configuration `1s^2 ,1s^2 2p^6, 3s^1 3p^1` correctly describes :

A

Ground state of Na

B

Ground state of `Si^+`

C

Excited state of mg

D

Excited state of `Al^(3+)`

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Verified by Experts

The correct Answer is:
C
Ground state of `._(12)Mg` is `1s^2 . 2s^2 2p^6 , 3s^2`.
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P BAHADUR-ATOMIC STRUCTURE-Exercise 3A
  1. The line spectrum of two elements is not identical because

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  2. If the speed of electron in the first bohr orbit of hydrogen atom is x...

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  3. The elecronic configuration 1s^2 ,1s^2 2p^6, 3s^1 3p^1 correctly descr...

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  4. Which of the following statement //s is not correct ?

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  5. Rutherfore's alpha particke scatterubg exoerunebt evebtykk ked if tge ...

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  6. Which element isrepresencted by the following electronic configuration...

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  7. F-orbitals in presence of magnetic field are :

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  8. how fast is an elecreon moving if it has a wavelength equal to the dis...

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  9. The work functio of a substance is 4.0 eV. The longest wavelength of ...

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  10. The electron in a hydrogen atom makes a transition from an excited sta...

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  11. The transition from state n = 4 to n = 3 in a He^(o+) ion result in u...

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  12. A hydrogen atom and a Li^(2+) ion ae both in the second excited state ...

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  13. psi(310) has :

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  14. de-Broglie concept of wave is related to :

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  15. Which of the following is correct for the same radius of ion ieach pai...

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  16. IE1 for .1H^2 and IE1 for .1H^1 are related as ?

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  17. The spein multipltcity for the orbital enryron si 2s +1where (s) is t...

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  18. The enrgy level fo 4s-orbital is less than 3d- orbital because :

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  19. The number fo spectiral lines produced according to Bohr's concept whe...

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  20. A s-orbital is symmetricla aout the :

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