element: a basic building block of matter; a pure substance that cannot be broken down into anything simpler.
compound: a chemical combination of two or more elements into a single substance.
atom: the smallest unit of an element that still has the properties of the elements.
proton: a particle with a positive charge in the nucleus of an atom.
neutron: an uncharged particle in the nucleus of an atom.
electron: a particle with a negative charge moving around the nucleus of an atom.
nucleus: the dense center part of an atom.
molecule: a group of more than one atom joined together that acts like a single particle.
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