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What a non metal actually is? A non metal is a poor conductor of heat and electricity, the substance is also brittle, sonorous,transparent and may be solids, liquids or gases at room temperature.
This is a picture of periodic table with a non metals and metals on it.
Some examples of non metals: Bromine
Test :Metals usually conduct electricity. You could see if you could run a battery thru the metal wire.If the battery is gonna be working then it's a conductor however if it doesn't it's an insulator.
Another tip If you put a metal spoon in a glass of ice water, it will get cold. A non-metal spoon (say a plastic one) will not.
If you will use these tips for tests you'll find out if the substance you are looking for is a non metal or a metal. Good Luck and thanks for watching.