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A compound is a substance made from two or more elements that have reacted chemically with each other. Remember this definition as you might need it in the exam! A compound is a completely new material that will often have totally different properties from the elements that made it. For example The element sodium is a highly reactive metal. The element chlorine is a yellow-green poisonous gas (non-metal). When the two react together they form a compound called sodium chloride.
note that a compound consists of atoms of two or more different elements bound together can be broken down into a simpler type of matter elements by chemical means but not by physical means has properties that are different from its component elements and always contains the same ratio of its component atoms