what is atoms ? please tell me fast it's urgent please .......
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Atoms are the basic units of matter and the defining structure of elements. 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.
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An atom is the smallest unit of ordinary matter that forms a chemical elements.
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