1) All mater is made up of small particles called atoms
2)All atoms of any given typer ar similar to one another and significantly different from all other types
3) The relative number and arrangement of different atoms in a pure substrance determine its identity.
4)Chemical change is a union separtaion, or rearrangement of atoms to give new substances
5) Only whole atoms can participate in or result from any chemical change, since atoms are considered indestructible during such changes