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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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Why elements of group 18 known as noble gases?

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NCERT-THE P-BLOCK ELEMENTS-EXERCISE
  1. Why are the elements of group 18 known as noble gases?

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  2. Why are pentahalides of P,As,Sb and Bi are more covalent than trihalid...

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  3. Why is BiH3 the strongest reducing agent amongst all the hydrides of g...

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  4. Why is N(2) less reactive at room temperature ?

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  5. Mention the conditions required to maximise the yield of ammonia.

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  6. How does ammonia react with a solution of Cu^(2+)?

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  7. What is the covalence of nitrogen in N2O5?

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  8. Bond angle in PH(4)^(+) is higher than that in PH(3).Why ?

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  9. What happens when white phosphorus is heated with concentrated NaOH so...

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  10. What happens when PCl(5) is heated?

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  11. Write a balanced equation for the reaction of PCl5 in heavy water.

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  12. What is the basicity of H(3)PO(4) ?

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  13. What happens when H(3)PO(3) is heated.

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  14. List the important sources of sulphur.

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  15. Write the order of thermal stability of the hydrides of group 16 eleme...

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  16. Why is H(2)O a liquid and H(2)S a gas?

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  17. Which of the following does not react with oxygen directly? Zn,Ti,Pt,F...

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  18. Complete the following reactions: (i) C(2) H(4) + O(2) to (ii)...

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  19. Why does O3 act as a powerful oxidising agent?

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  20. How is O(3) estimated quantitatively ?

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  21. What happens when sulphur dioxide is passed through an aqueous solutio...

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