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An iron is typically used to take creases out of clothes. It generates heat which helps to smooth out wrinkles in the fabric when pressed against it.
Mercury is the element commonly used in liquid-in-glass thermometers.
Fluorine is the element used in toothpaste as fluoride, while Teflon is made of the element fluorine in combination with carbon to create a non-stick coating.
No, the prefix mono is generally not used for the first element in a binary covalent compound. It is typically omitted for the first element but used for subsequent elements to indicate the number of atoms present in the compound.
Hydrogen was used by Dalton as his standard for atomic mass.
A term used to describe any element or compound is called a substance or substances.