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Why does spin quantum number introduced...

Why does spin quantum number introduced ?

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When we observe spectrum of yellow light by using high resolution spectroscope it has very closely spaced doublet. Similar patterns are shown by Alkali and Alkaline earth metals. In order to account this spin quantum number is introduced.
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VGS PUBLICATION-BRILLIANT-STRUCTURE OF ATOM -CREATIVE QUESTIONS FOR NEW MODEL EXAMINATION ( SECTION - II 1 MARK)
  1. What is the meaning of word 'Aufbau'?

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  2. Why are zero group elements called noble gases or inert gases?

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  3. Why does spin quantum number introduced ?

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  4. Write the set of quantum numbers for the electrons in a 3p(z) orbital.

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  5. What is the difference between an orbit and orbital ?

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  6. Write the set of quantum numbers for the lastly entered electron of ox...

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  7. What are the factors which influence electromagnetic energy '?

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  8. Do all the p-orbitals have the same energy ?

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  9. What is the value of Planck's constant

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  10. What is maximum value of 'l' for n = 3 ?

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  11. How many values can l have for n = 4 ?

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  12. Write the four quantum numbers for the differentiating electrons of li...

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  13. Write four quantum numbers for 2p^(1) electron .

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  14. How many electrons are occupied by an orbital ?

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  15. Which rule is violated in the following electronic configuration?

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  16. How many maximum number pf electrons can be accommodated in a principa...

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  17. The maximum number of electrons that can be accommodated in the L-shel...

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  18. How many maximum number of electrons can be accommodated in d sub-shel...

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  19. How many sub-shells present in a 'M' principal energy shell?

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  20. How many orientations can 's-orbital' exhibit ?

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