Element:Abasic building block of matter ;a pure subtance that cannot be broken down into anything simpler.
Compound:A chemical combination of two or more elements into a single subtance.
Atom:The smallest unit of an element that still has the properties of the element.
proton:Aparticle with positive charge in the necleus of an atom.
Neutron:An uncharged particle in the necleus of an atom.
Electron:Aparticle with a negative charge moving around the necleus of an atom.
Necleus:The dense center part of an atom.
Molecule:A group of morethan one atom joined together that acts like a single particle.
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