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Group 7 Halogens Trends in Boiling Points

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
At2170230never been seen

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Specification: OCR Chemistry A (H032), AS-level, 3.1.3 The halogens. Topic: Reactivity Trends.

Key terms in this lesson

Group
A vertical column of the periodic table, containing elements with the same number of outer-shell electrons.

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