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Why do helium, neon and argon have a zer...

Why do helium, neon and argon have a zero valency?

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All the three elemetns have completely filled valence shells according to Bohr Bury scheme. Therefore their valencies are zero .For more details please consult section 4.9
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DINESH PUBLICATION-STRUCTURE OF ATOM -Long Answer Question
  1. (a) Give the schematic atomic structures of chlorine atom and chloride...

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  2. Answer the following in one line or two: (a) what is the maximum nu...

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  3. Which observations in scatteing experiment led Rutherford to make the ...

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  4. With the help of suitable acitivies shows that (i) cathode rays trav...

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  5. The average atomic mass of a sample of an element X is 16.2 mu. What i...

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  6. Give reasons for the following: (a) Isotopes of an element are chemi...

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  7. The following data repersents the distribution of electons protons and...

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  8. An atom of an elements has two electrons in outermost M shell state it...

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  9. (a) why are the chemical properties of the isotopes same? (b) Draw b...

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  10. (a) In the gold foil experiment , what observations led Rutherford t...

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  11. (a) state the postulates stated by neils bohr in order to overcome the...

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  12. Define isotopes why do isotopes have same atomic number but differente...

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  13. Why do helium, neon and argon have a zero valency?

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  14. The ratio of the radii of hydrogen atom and its nucleus is ~ 10^(5). ...

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  15. Enlist the conclusions drawn by Rutherford from his alpha-ray scatteri...

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  16. In what way is the Rutherford's atomic model different from that of Th...

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  17. What were the drawbacks of Rutherford's model of an atom?

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  18. What are the postulates of Bohr's model of an atom?

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  19. Show diagramatically the electron distributions in a sodium atom and a...

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  20. In the gold foil experiment of Geiger and Marsden, that paved the way ...

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