atom- the basic unit of a chemical element
chemical compound- chemical substance
crystal- a piece of a homogeneous solid substance
compound- a mixture
electron- subatomic particle with a negative energy
element- part of something abstract
ion- atom or molecule with a net electric charge
matter- physical substance in general
mineral- a solid inorganic substance of natural occurrence
molecule- group of atoms bonded together
neutron- neither negatively nor positively charged
nucleus- the center of an atom
proton- positively charged
silicate- a salt in which the anion contains silicon & oxygen
