a chemical element that is a common greyish-coloured metal. It is strong, and exists in very small amounts in blood

a simple substance that cannot be reduced to smaller chemical parts

a chemical element that exists in its pure form as diamond or graphite, and is an important part of other substances such as coal and oil, as well as being contained in all plants and animals

a chemical element that is a heavy, silver-coloured metal, liquid at normal temperatures

a chemical element that is a gas lighter than air, that will not burn and is used in balloons, airships, and some types of lights

a chemical element that is a reddish-brown metal, used especially for making wire and coins

a chemical element that is not a metal

a generally hard and shiny chemical element, such as iron or gold, or a mixture of such elements, such as steel, which usually allows electricity and heat to travel through it

a quality in a substance or material, especially one that means that it can be used in a particular way

home of Superman

a soft, silver-white metal that burns quickly in the air and is used in special hard glasses and fertilizers (= substances that help crops grow better)

a chemical element that is a gas with no smell or colour. Its forms a large part of the air on earth, and is needed by animals and plants to live

a chemical element that is present in teeth, bones, and chalk