| A | B |
|---|
| matter | Anything that has weight and takes up space. |
| atoms | The building blocks of matter. |
| protons | Found in the nucleus of an atom. They have a positive charge. |
| neutrons | Found in the nucleus of an atom. They have no charge. |
| electrons | Orbit the nucleus of an atom. They have a negative charge. |
| periodic table of elements | A chart that organizes elements that make up matter found on Earth. |
| solid | A state of matter where the particles are touching and move very little. |
| liquid | A state of matter where the particles are touching and move past each other. |
| gas | A state of matter where the particles are spread far apart, and move very easily. |
| molecules | Two or more atoms that are joined together. |
| compounds | Two or more elements that are joined together to form something new. |
| water | 2 Hydrogens and 1 oxygen |
| carbon dioxide | 1 carbon and 2 oxygens |
| table salt | 1 sodium 1 chlorine |
| Molecules move faster when they are ______. | heated |
| Molecules move slower when they are ______. | cooled |
