element:abasic building block of matter;a pure subtance that cannot be broken down into anything simpler.
compound:a chemical combimaton of two or more elements into a single substance.
atom:the smallest unit o an element that still has the properties of the element.
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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