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The Periodic Table
What are the Halogens?
The halogens are fluorine, chlorine,
bromine, iodine and astatine.
Astatine is radioactive and is not studied at GCSE.
The halogens are in group 7 on the right of the periodic table.
See the halogens for shortcuts to the pages of this section.
What is the Structure of the Halogens?
The halogens are all diatomic covalently bonded
Diatomic means that each molecule contains two atoms.
The formulae are F2, Cl2, Br2, I2, (see the structure of chlorine).
How do the Halogens React with other Substances?
of the halogens
1. gain one electron from a metal to form an ionic bond
2. share one electron with a non-metal to form a covalent bond.
For example, see hydrogen chloride or the structure of chlorine.
Links The Halogens Revision Questions
gcsescience.com The Periodic Table Index Periodic Table Quiz gcsescience.com
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