| A | B |
|---|
| four fundamental elements | earth, air , water, fire |
| proton | positively charged subatomic particle |
| electron | negatively charged subatomic particle |
| nuetron | subatomic particle with no charge |
| law of definite proportions | compounds are in certain proportions by mass |
| isotope | atoms of an element that are chemically alike but differ in mass |
| electron cloud | spherical regions of space in which the electrons are most likely found |
| valence electrons | the electrons in the outermost level |
| Lewis Dot diagram | short hand method to illustrate the valence electrons |
| atomic number | tells you the number of protons and electrons in a neutral atom |
| nuetral | no charge |
| mass number | sum of protons and neutrons in the nucleus |
