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Why are the elements of Group - 18 known...

Why are the elements of Group - 18 known as noble gases?

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The elements of group of 18 have their valence shell orbitals completely filled. As a result, they react with only a few elements (oxygen and fluorine) only under certain conditions. Therefore, they are called noble gases.
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OSWAAL PUBLICATION-P - BLOCK ELEMENTS-TOPIC - 4 (GROUP - 18 ELEMENTS, THEIR PROPERTIES AND SOME IMPORTANT COMPOUNDS)(VERY SHORT ANSWER TYPE QUESTIONS)
  1. Why has it been difficult to study the chemistry of radon ?

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  2. Helium and neon do not form compounds with fluorine. Why ?

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  3. Why are the elements of Group - 18 known as noble gases?

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  4. Neon is generally used for warning signals. Why ?

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  5. Why do noble gases form compounds with fluorine and oxygen only?

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  6. What prompted Bartlett to the discovery of noble gas compounds.

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  7. Noble gases have very high ionisation enthalpy. Why ?

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  8. Ionisation enthalpy decreases down the group in noble gases. Why ?

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  9. How does atomic radii changes in group - 18 elements ?

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  10. Noble gases have large positive values of electron gain enthalpy. Why ...

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  11. Name the first noble gas compound prepared by Neil Bartlett?

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  12. Give common names of noble gases.

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  13. How is XePtF(6) prepared ?

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  14. How is radon obtained ?

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  15. What is the percentage of noble gases in the atmospheric air ?

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  16. Which noble gas in most abundant in atmospheric dry air?

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  17. Why noble gases are called rare gases ?

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  18. Why are the elements of Group - 18 known as noble gases?

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  19. Why the noble gases are called inert gases ?

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  20. Write the general electronic configuration of noble gases.

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