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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.
atom. 1  smallest part of an element that has all the properties of an element, (physics and chemistry) the smallest component of an element having the chemical properties of the element. 2  combining of atoms of elements to form new substances. 3  electron in the outermost energy level of an atom.