define atom and it uses
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The definition of an atom is the smallest component of an element, characterized by a sharing of the chemical properties of the element and a nucleus with neutrons, protons and electrons. ... Hydrogen and helium are examples of elements that have an atom.
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We now know that atoms are made up of three particles: protons, neutrons and electrons — which are composed of even smaller particles, such as quarks. Atoms were created after the Big Bang 13.7 billion years ago. ... Quarks came together to form protons and neutrons, and these particles combined into nuclei.
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