Edexcel GCSE Chemistry The halogens
This page covers the following topics:
1. Melting and boiling points of halogens
Halogens form small covalent molecules with the formula X₂ held together by van der Waals forces. Larger molecules can have stronger van der Waals interactions, increasing the energy needed to separate them from other molecules. Therefore, the melting and boiling points of halogens increase with an increasing atomic radius and the size of molecules as you travel down the group 7 of the periodic table. Due to different melting and boiling points, fluorine and chlorine at room temperature are gases, bromine - liquid and iodine - solid.
Explain how does the melting point change going down the group 7 of the periodic table.
Which halogen has the lowest boiling point?
Which halogen has a higher melting point than fluorine and is gas at room temperature?
The melting point of fluorine is −220°C and the melting point of bromine is −7.2°C. Estimate the melting point of chlorine.
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