Periodicity; Melting and Boiling Point

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  • Melting point decreases DOWN THE GROUP.
  • Larger ionic radius down the group
  • increase in shielding
  • Weaer attraction between delocalised electrons to positive ions

Across the period:

  • Melting point increases
  • More delocaised electrons, ions
  • greater charge
  • Greater attraction between delocalised electrons and positive ions 

DIAMOND,GRAPHITE AND SILICON DIOXIDE:

  • Very high melting and boiling point
  • Lots of energy

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