Key term for Edexcel GCSE Chemistry, used in Group 7.
A negatively charged ion formed when a halogen atom gains one extra electron (e.g., chloride, bromide).
Halide ion appears in Edexcel GCSE Chemistry revision content for Groups in the Periodic Table, especially Group 7 and Explanation of Relative Reactivity.
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Groups in the Periodic Table
Group 7 • Reactions with Metals
