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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.
The chart below outlines two basic physical properties of metals and non-metals. Metalloids share some of the physical properties of both, so a third property will be used to tell metalloids apart from metals and non-metals. Property Metals Non-Metals Luster High metallic luster (shiny) No metallic luster (dull) Malleability Can be hammered into