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Metallic elements
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Metals are good thermal and electrical conductors, they are strong, shiny, malleable and ductile.
Non-metals are normally poor thermal and electrical conductors, they are not strong, and are dull and brittle.
Graphite is a non-metal that is a good electrical and thermal conductor.
Metals are found on the left side and in the middle of the periodic table, non-metals on the right side.