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Helium is a non-metal because it is a gas at room temperature. It looks like air. Helium is used to inflate blimps, scientific balloons, and party balloons. It is used as an inert shield for arc welding, to pressurize the fuel tanks of liquid fueled rockets and in supersonic windtunnels.

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Silicon is a metalloid because it has luster, but is a semiconductor. It looks like some kinds of obsidian. It is used to make computer chips and related hardware. It is also used in high-tech devices

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Titanium is a metal because it is lustrous, a good conductor, and is malleable. It looks shiny and silvery.
It is useful because it is as strong as some steels and is 45% lighter. It also resists corrosion and it has highest strength-to-weight ratio of any metal.

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Non metals are almost the opposite of metals. A lot of non-metals are gases at room temperature. They are poor conductors and don't have luster

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Some metalloids are called semiconductors. They have some properties of metals and some properties of non-metals

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Metals are ductile and malleable, meaning that they can be easily hammered flat without breaking and pulled into wires. They have luster, meaning they are shiny. They are solid at room temperature. All metals are good conductors.