Chemistry 9701 · AS & A Level · States of matter

States of matter — practice question

Fluorine and iodine belong to Group 17. Their melting points are not the same because the van der Waals’ forces between molecules have different strengths. Which row is correct?

  • Amelting point: $\text{F}_2 > \text{I}_2$; van der Waals’: $\text{F}_2 > \text{I}_2$
  • Bmelting point: $\text{F}_2 > \text{I}_2$; van der Waals’: $\text{F}_2 < \text{I}_2$
  • Cmelting point: $\text{F}_2 < \text{I}_2$; van der Waals’: $\text{F}_2 < \text{I}_2$
  • Dmelting point: $\text{F}_2 < \text{I}_2$; van der Waals’: $\text{F}_2 > \text{I}_2$

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