| A | B |
|---|
| physical properties | characteristic that is seen |
| chemical properties | characteristic of ability to change |
| phases | different states of matter |
| atoms | basic unit of matter |
| atomic number | number of protons in nucleus |
| electron | negative particles in electron cloud |
| neutron | nuetral particles in nucleus |
| proton | positive particles in nucleus |
| energy level | surround nucleus with electrons |
| isotope | same protons but different nuetrons |
