The hardness, melting point and boiling point of elements increase from Ce to Lu because

Chemistry · JEE Main · NTA Examsd- and f-Block Elements

The hardness, melting point and boiling point of elements increase from Ce to Lu because
  1. the attraction between the atoms increases as the size increases
  2. the attraction between the atoms decreases as the size increases
  3. the attraction between the atoms increases as the size decreases
  4. the attraction between the atoms remains the same as the size increases

Answer

(C) the attraction between the atoms increases as the size decreases

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