Oxides group 1 oxides are very basic and dissolve in water to make a strongly alkaline solution group 2 oxides are basic and dissolve sparingly in water aluminium and zinc oxides are amphoteric non-metal oxides react with water to produce acids. Non-metals are often gases or solids with low melting points are often brightly coloured. The tutorial shows the trends in a non-metal group. One extra electron gives halogens a noble gas structure. This makes them the most reactive non-metals on the Periodic Table.
Bromine water is also a weak acid that bleaches litmus.
Iodine does not dissolve easily in water. It is very slightly acidic in water and has a slight bleaching effect. The most reactive elements form the most stable compounds . Fluorine displaces all other halogens. Chlorine displaces bromine from bromides and iodine from iodides.