Key term for AQA GCSE Chemistry, used in Ion Identification.
A negative ion (anion) formed when a halogen atom from Group 7 gains one electron (e.g., Cl⁻, Br⁻, I⁻).
Halide ion appears in AQA GCSE Chemistry revision content for Chemical analysis, especially Ion Identification and Test for Halides.
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Atomic structure and the periodic table
The Periodic Table • Group 7 Halogens
