![]() Solids, like ice or concrete, have a fixed shape and cannot be compressed easily. A few non-metals, such as carbon and sulphur, are in a solid close solid One of the three states of matter. Non-metal elements with these properties include oxygen, hydrogen and chlorine. at room temperature and do not conduct electricity. Gases, like oxygen or helium, do not have a fixed shape and can expand to fill their container. Most non-metals are gases close gas One of the three states of matter. Liquids, like water or oil, do not have a fixed shape and can flow. Mercury is the only metal that is liquid close liquid One of the three states of matter. Metals include gold, aluminium and iron which are all solid at room temperature. Most elements are metals, which are shiny and conduct electricity well. ![]() The periodic table lists all the known elements, grouping together those with similar properties close properties The properties of a substance are the qualities and characteristics of a substance that describe and identify it. ![]() Everything in the universe contains the atoms of at least one or more elements. We often think of atoms as tiny spheres, but in fact they are made from smaller particles called protons, neutrons and electrons. There are about 100 elements, each with its own type of atom close atom The smallest particle of an element. 2 In metallurgy, for example, a heavy metal may be defined on the basis of density, whereas in physics the distinguishing criterion. The criteria used, and whether metalloids are included, vary depending on the author and context. An element is a substance that cannot be broken down into any other substance. Heavy metals are generally defined as metals with relatively high densities, atomic weights, or atomic numbers. ![]()
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