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25% of of the element nickel is inside a united states money nickel.
The symbol of an element is an abbreviation for the element's name, and it is derived either from the English or the Latin name. For example: Bromine's symbol is Br. The symbol inside an element's square is the element's atomic number, or the number of protons and neutrons in the element.
No, helium inside a balloon is not a compound. Helium is a chemical element and is the second lightest element on the periodic table. It exists as individual helium atoms inside the balloon.
The most important are carbon and oxygen.
I think you're asking which element is inside of thermometers. If sooo, it's mercury =]