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GCSE Combined Science · key term
A negatively charged ion formed when a halogen atom gains one electron, such as .
Used by AQA and Edexcel
Specification 5.1.2.6, 5.4.3.4 · Paper 3
Revise: Group 7 HalogensA halogen atom needs one more electron to complete its outer shell. It can gain an electron to form a halide ion with a charge of −1, or share electrons in a covalent bond.
A negatively charged ion of a halogen, such as chloride, , bromide, , or iodide, .
Specification Group 7 · Paper 3, Paper 4
A negative ion formed when a halogen atom gains one electron; it has a charge of −1.
Revise: Halogen reactions and reactivityThe elements themselves consist of diatomic molecules: Cl₂, Br₂ and I₂. These neutral molecules are different from the negatively charged halide ions found in their salts.
A halide ion is not a halogen: chloride ions form chlorine, bromide ions form bromine and iodide ions form iodine.
Distinguish a halogen molecule, such as Cl₂, from a halide ion, such as Cl⁻. Halide ions have a −1 charge.
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