smallest particle of an element
atom
a pure substance made of only one kind of atom
element
a group of atoms bonded together
molecule
positively charged particle of an atoms nucleus
proton
particle of an atom's nucleus that can be found by subtracting atomic number from atomic mass
neutron
negatively charged particle that orbits the nucleus of an atom
electron
the number of protons in the nucleus of an atom
atomic number
a one or two letter representation of an element
chemical symbol
a combination of chemical symbols and numbers to represent a substance
chemical formula
number of protons and neutrons
atomic mass
a change in matter that does not change its identity
physical change
color change, light created, temperature, bubbling, precipitate formed
evidence for chemical change
