| A | B |
|---|
| matter | anything that occupies space and has mass |
| atom | the smallest stable part of matter |
| element | a collection of similar atoms |
| protons | positive particles of atoms |
| neutrons | neutral particles of atoms |
| electrons | negative particles of atoms |
| ionic bonding | giving and taking of electrons |
| covalent bonding | sharing of electrons |
| energy | the ability to do work |
| diffusion | the movement of molecules from greater to lesser concentration |
| osmosis | the movement of water across a semipermeable membrane |
| catalysts | substances that affect the rate of a reaction |
