Parts of an atom and definitions

nucleus

made up of the protons and neutrons, this part of the atom contains nearly all the mass of the atom

atom

this is a building block of matter

electron orbit

this refers to the travel of electrons around the nucleus of an atom

electron

this small particle of an atom carries a negative charge

neutron

this small particle of an atom carries a neutral charge

proton

this small particle of an atom carries a positive charge