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Metals are very good conductors (can transfer heat and electricity), are malleable (can be hammered into sheets), are ductile (can be drawn into wire), are luster (are shiny), and are solid.

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Nonmetals are very different from Metals. Nonmetals are not malleable or ductile (they will shatter). Nonmetals are brittle (they break easily). Nonmetals are dull (are not shiny). Nonmetals are insulators (can NOT transfer heat and electricity).

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Metalloids have some properties of metals and some properties on non-metals, some are also called semiconductors (can carry an electrical charge under certain conditions). Metalloids are solid and at room temperature, can be both shiny or dull, brittle (not ductile).

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Copper is a metal, because it is a conductor, it's malleable, it's ductile, and its luster. Copper is a reddish-gold metal that is easily worked.
Copper is useful in our everyday lives, because it is used for pennies. It is also a very good conductor and is ductile, so it is used for wires.

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Oxygen is a Non-metal, because it is not malleable, or ductile. It is brittle, dull, and an insulator. Oxygen is a colourless, odourless gas.
Oxygen is VERY useful for all living organisms, because we need it to breath.
Without oxygen we could DIE.
Most oxygen comes from tiny ocean plants called phytoplankton.

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Silicon is a metalloid, because it is a semiconductor, is solid and at room temperature, can be both shiny or dull, and is brittle.
Silicon is a solid with a blue-grey metallic sheen.
Silicon is used to make concrete and cement. It is present in pottery, enamels and high-temperature ceramics, also used extensively as a semiconductor in solid state devices in the computer and microelectronics industries. As well as used in sealants, adhesives, lubricants, medicine, cooking utensils, and thermal and electrical insulation.