| Question | Answer |
|---|---|
| anything that has mass and takes up space | matter |
| a material that cannot be broken down into anything simpler | element |
| is the smallest unit of an element that retains the properties of that element | atom |
| the center of an atom | nucleus |
| are particles with one unit of positive electric charge each | protons |
| are particles with no electric charge | nuetrons |
| are smaller particles with one unit of electric of negative electric charge each | electrons |
| are particles with more than one atom joined togther | molecules |
