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Hi Helen,
Certainly depends on your exam board and the number of marks available. I would recommend looking at past papers/mark schemes.
If you are struggling feel free to book a lesson with me :)
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A halogen is a group 7 element on the periodic table. (Normally form 1- ions e.g Fluorine (ion is fluoride F-), chlorine (ion is Chloride Cl-), bromine (Bromide Br-) and so on down the table
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Helen
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