Elements. Bromine (left, in jar), silicon (upper right), copper (grains) and aluminium (table). The world around us is made of a limited number of chemical elements, which combine together to make all chemical compounds. Water, for instance, is made from the elements hydrogen and oxygen. These four elements include three metals (aluminium, silicon and copper) and one non-metal - bromine, which is a gas at room temperature. There are 82 stable elements and a small number of unstable, radioactive elements.
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