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A metalloid is an element that has properties that are intermediate between those of metals and nonmetals. Metalloids can also be called semimetals. On the periodic table, the elements colored yellow, which generally border the stair-step line, can be considered to be a metalloids.

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Non-metals are not able to conduct electricity or heat very well. but the non-metals that exist in two of the three states of matter at the room temperature: gases such as oxygen and or solids such as carbon. The non-metals have no metallic luster, and will not reflect light.

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Metals can be sometimes described as lattice of positive ions that are surrounded by a cloud of delocalized electrons. ... The traditional definition focuses on the bulk properties of metals.

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Metals, Non-Metals and Metalloids - What Are Their Properties? - GCSE Chemistry

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Metals and Nonmetals Physical Properties - Part 2 | Don't Memorise