Metal, Non-Metal, Metalloid

Elements

Metal

Aluminum is a metal because it has a very high melting point. It is also malleable. For example, aluminum foil is a great example of a malleable substance. The density of pure aluminum is around 2.70 grams per cubic cm squared

Non-Metals

Krypton is an example of a non-metal. Krypton is a poor conductor of energy. Krypton is not malleable because you can't hammer it down. Krypton is like a light source. it is similar to neon.
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Metalloid

An example of an metalloid is Germanium. It is brittle, luster, and very shiny. It is also a good conductor of heat and energy.