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An element is a substance consisting of atoms which all have the same number of protons-i.e. the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical methods. Elements can only be changed into other elements using nuclear methods. Although an element's atoms must all have the same number of protons, they can have different numbers of neutrons and hence different masses.
An element is a pure substance that is made from a single type of atom. Elements are the building blocks for all the rest of the matter in the world.