Fluorine: Yellow gas, 9 electrons in total, Most reactive, Lowest boiling point, Highest electronegativity, Chlorine: Green gas, 17 electrons in total, Used to disinfect water., Best oxidising agent used in displacement reactions., Bromine: Red-brown, Liquid, 35 electrons in total, Used to demonstrate diffusion., Iodine: Grey, Solid, Least reactive, Highest boiling point, Lowest electronegativity,

Group 7 - element properties

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