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Trends in Melting and Boiling Temperature

The halogens exist as diatomic molecules X2 at room temperature and pressure. Melting and boiling points increase down the group.
Halogen    Number of electrons    Boiling point °C    Appearance and state at RTP
 
F218-188pale yellow gas
Cl234-34pale green gas
Br27059red-brown liquid
I2106184shiny grey-black solid
At2170337 (estimated)never been seen

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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 4B: The elements of Group 7 (halogens). Topic: Group 7.

Key terms in this lesson

halogen
Any element in group 7 of the periodic table, existing as diatomic molecules.

More in Group 7

All 14 lessons in Group 7 · All Edexcel AS-level Chemistry topics