| A | B |
|---|
| Matter | Anything that has mass and takes up space |
| Atoms | Tiny building blocks of matter, made up of protons, neutrons, and electrons |
| Element | Substance that is made of only one type of atom |
| Proton | Subatomic particles with a positive electric charge |
| Neutrons | Subatomic particles that have no charge |
| Electrons | Subatomic particles that have a negative electric charge |
| Atomic Number | The number of protons in an atom |
| Mass Number | The number of protons plus the number of neutrons in an atom |
| Isotopes | Atoms of the same element that have different numbers of neutrons |
| Compound | Atoms of more than one type of element that are chemically bonded together |
| Molecule | A group of atoms connected by covalent bonds |
| Ions | Electrically charged atoms |
| Mixture | Composed of two or more substances that are not chemically combined |
| Heterogeneous Mixture | A mixture which is not mixed evenly and each component retains its own properties |
| Homogeneous Mixture | A mixture which is evenly mixed throughout |
| Solution | A mixture which is evenly mixed throughout; also known as a homogeneous mixture |
| Density | A measure of the mass of an object divided by its volume |
| Specific gravity | The comparison of an object's mass and volume to the mass and volume of water |
