All metals are solid at room temperature except mercury. In general, metals have shiny surfaces. Examples are gold, aluminium, copper, iron, lead, silver, platinum, uranium and zinc
Most non-metals are gases. Examples of non-metals are carbon, bromine, sulphur, and iodine. Usually have dull surfaces.
Metalloid are unique as they have some properties of metals and other properties of non-metals at different conditions. Examples of metalloid are silicon, germanium, and arsenic.