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Metal elements are usually good conductors of both electricity and heat. The dividing line between metals and non-metals is not hard and fast, thus the distinction between Post-transition metals and Metalloids is represented differently on different versions of the Periodic Table.etal elements are usually good conductors of both electricity and heat. The dividing line between metals and non-metals is not hard and fast, thus the distinction between Post-transition metals and Metalloids is represented differently on different versions of the Periodic Table.
Thomas Northcut/Photodisc/Getty Images. Metals and nonmetals differ from each other in more ways than they are similar. In most cases, their properties oppose each other. Their similarities exist in their most basic aspects, such as structure and the way they combine with other elements to form molecules.homas Northcut/Photodisc/Getty Images. Metals and nonmetals differ from each other in more ways than they are similar. In most cases, their properties oppose each other. Their similarities exist in their most basic aspects, such as structure and the way they combine with other elements to form molecules.