General structure of a halogen - X2, General structure of a halide - X-, Appearance of fluorine - Yellow gas, Appearance of chlorine - Green gas, Appearance of bromine - Red/brown liquid or orange/brown gas, Appearance of iodine - Dark grey solid or purple gas, Appearance of fluorine when dissolved in water - Colourless, Appearance of chlorine when dissolved in water - Pale green, Appearance of bromine when dissolved in water - Orange, Appearance of iodine when dissolved in water - Brown,

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