| A | B |
|---|
| Matter | Anything that has weight or mass and takes up space. |
| Atom | The smallest whole bit of an element that still keeps all the properties of that substance. |
| Solid | Matter that has a definite size and shape. |
| Liquid | Matter that has a definite size and takes the shape of its container. |
| Gas | Matter that has no definite size and takes the shape of its container. |
| Molecule | Combination of atoms from two or more elements. |
| Elements | Made up of only one kind of atom. |
| Chemistry | The science that deal with substances. |
| Inertia | The tendency of matter at rest to stay at rest, and matter in motion to stay in motion until an outside force interferes. |
| Mass | The quantity of matter an object contains. Not affected by gravity. |
| Weight | Measure of the pull of gravity. |
| Volume | The amount of space an object occupies. |
| Density | A measure of how much matter is packed into a certain space. |
| Nucleus | The center of an atom. |
| Proton | A positively charged particle in the nucleus. |
| Neutron | A neutral particle found in the nucleus. It has no charge. |
| Electron | Negatively charged particle that move around the nucleus of an atom. |
| Atomic Number | The number of protons in an atom; also the number of electrons. |
| Bohr Model | Model that compares the parts of an atom to the planets orbiting the sun. |
| Electron Cloud Model | Model that shows the electrons in a cloud around the nucleus. |
| Symbol | The letter or letters that stand for an element. |
| Periodic Table of Elements | A chart that groups all of the elements by similar properties. |
| H | The symbol for Hydrogen. |
| He | The symbol for Helium. |
