1.

Explain the following in the case of group 17 elements : (i) Density (ii) Melting and boiling point

Answer»

Density :

  • Down the group, density of halogens increases.
  • This is, because down the group, van der Waals forces of intermolecular attraction increase, and hence tendency for agglomerisation increases. Therefore density increases.

Melting point and boiling point : 

  • Halogens have low melting points and boiling points. 
  • Melting points and boiling points increase down the group. 


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