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Why are the elements of group 18 known a...

Why are the elements of group 18 known as noble gases ?

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The elements present in Group 18 have their valence shell orbitals completely filled and, therefore, react with a few elements only under certain conditions. Therefore, they are now known as noble gases.
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NCERT TELUGU-THE P-BLOCK ELEMENTS -Exercises
  1. Why are the elements of group 18 known as noble gases ?

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  2. Discuss the general characteristics of Group - 15 elements with refere...

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  3. Why does the reactivity of nitrogen differ from phosphorus ?

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  4. Discuss the trends in chemical reactivity of group 15 elements

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  5. NH(3) forms hydrogen bonds but PH(3) does not - why ?

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  6. How is nitrogen prepared in the laboratory ? Write the chemical equa...

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  7. How is ammonia manufactured by Haber's process ? Explain the reactions...

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  8. Illustrate how copper metal can give different products on reaction wi...

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  9. Give the resonating structures of NO(2) and N(2)O(5).

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  10. The HNH angle is higher than HPH, HAsH and HSbH angles - Why ?

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  11. Why does R(3)P=O exist but R(3)B=O does not (R = alkyl group) ?

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  12. Explain why is NH(3) basic while "BiH"(3) is only feebly basic.

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  13. Nitrogen exists as diatomic molecule and phosphorus as P(4) - Why ?

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  14. Write the difference between the properties of white phosphorus and re...

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  15. Why does nitroggen show catenation properties less than phosphorus ?

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  16. Give the disproportionation reaction of H(3)PO(3).

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  17. Can PCl(5) act as an oxidising as well as a reducing agent? Justify.

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  18. Justify the placement of O, S, Se, Te and Po in the same group of the ...

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  19. Why is dioxygen a gas but sulphur a solid ?

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  20. Knowing the electron gain enthalpy values for O to O^(-) and O to O^(2...

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  21. Which aerosols deplete ozone?

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