Group 7 elements are ____ molecules. Their molecules are bonded ____. As you go down Group 7, the colours get ____ and the melting and boiling points ____. For example, chlorine is a ____ gas, whereas iodine is a grey ____. At the bottom of Group 7 is astatine - a very rare and radioactive substance. We predict that it will be a ____ solid at room temperature and be less reactive than the other halogens. Halogens are ____ and should be handled in a fume cupboard. They take part in displacement reaction and redox reactions. During redox, oxidation is the ____ of electrons and reduction is the ____ of electrons. Halogens can react with metals to form ionic salts. They can also react with hydrogen to form hydrogen halides - when these dissolve in water they form ____. The reactivity of the Halogens ____ as you go down Group 7. This is because the atoms get larger as you go down the group, so if you add an electron to a shell further away from the nucleus it will be ____ strongly attracted so less likely to form a ____ ion.

Halogens Summary

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