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GCSE Combined Science · key term
An element in Group 7 of the periodic table, whose atoms have seven electrons in their outer shell.
Used by AQA and Edexcel
Specification 5.1.2.6 · Paper 3
An element in Group 7 of the periodic table. Halogen atoms have seven electrons in their outer shell.
Revise: Group 7 HalogensThe elements in Group 7 of the periodic table are the halogens. In order down the group, they are fluorine, chlorine, bromine, iodine and astatine. They are non-metals, and their similar chemical reactions arise from a shared feature: every halogen atom has seven electrons in its outer shell.
Specification Group 1, Group 7 · Paper 3, Paper 4
A non-metal element in Group 7 whose atoms have seven electrons in their outer shell.
Revise: Group 1Chlorine, bromine and iodine are halogens, while helium, neon and argon are noble gases. Hydrogen is positioned above the Group 1 metals, but it is not an alkali metal.
A non-metal element in Group 7 of the periodic table, such as chlorine, bromine or iodine.
For a displacement prediction, compare the added halogen with the halogen in the salt. The added halogen must be more reactive.
Give both the colour and the physical state when describing a halogen at room temperature.
Distinguish a halogen molecule, such as Cl₂, from a halide ion, such as Cl⁻. Halide ions have a −1 charge.
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