| A | B |
|---|
| matter | anything that takes up space and has mass |
| liquid | has an indefinite shape and a definite volume |
| solid | has a definite shape and a definite volume |
| gas | indefinite shape and volume |
| plasma | indefinite shape and volume, and electrically charged particles |
| nucleus | contains the protons and neutrons |
| electron cloud | contains the electrons |
| proton | positively charged |
| neutron | no charge |
| electron | negatively charged |
| Mendeleyev | created one of the first Periodic Tables |
