definitions
the smallest whole unit of matter
atom
the part of the atom that has no charge; found in the nucleus
neutron
anything that has mass and takes up space
matter
the center of an atom
nucleus
the negatively charged part of an atom, found orbiting the nucleus
electron
how much matter an object is made up of
mass
the positively charged part of an atom; found in the nucleus
proton
a substance made of just one type of atom which cannot be broken down or changed into another substance
element
the name of the element
chemical name
the # of protons which is equal to the # of electrons
atomic number
the # of protons plus neutrons (P+N)
atomic mass (weight)
Charged particles in the last/outermost shell. This allows for atoms to combine to form molecules.
Valence Electron
the letter(s) that represents the element
chemical symbol