Group 7 - The Halogens

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The halogens react with metals to form ionic compounds and with non-metals to form molecular compounds containing covalent bonds. 

If fluorine is added to solutions of sodium chloride, sodium bromide and sodium iodide, the products would be sodium fluoride and chlorine, sodium fluoride and bromine, or sodium fluoride and iodine. Fluorine is more reactive that the halide's halogen so a displacement occurs. 

Fluorine has a boiling point of -118°C and a melting point of -220°C, so is a gas at room temperature. Fluorine's atomic structure is: 2 electrons in the first shell and 7 in the second. Fluorine is added to things such as water and milk to prevent tooth decay and is also used in rocket fuels. 

Chlorine has a

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