| A | B |
|---|
| atom | A unit of matter made of a specific number of protons, neutrons, and electrons |
| atomic number | The number of protons an atom has |
| boiling point | The temperature at which a liquid turns into a gas |
| compound | A substance made of two or more elements |
| electron | A particle that consists of a charge of negative electricity |
| element | A material made of only one kind of atom |
| freezing point | The temperature at which a liquid turns into a solid |
| gas | A flowing substance with neither shape nor volume |
| liquid | A flowing substance that has no independent shape but has a definite volume |
| matter | Anything that takes up space and has substance |
| melting point | The temperature at which a solid turns into a liquid |
| molecule | smallest particle of substance with all the properties of the substance and is made of 1 or more atoms |
| neutrons | Uncharged particles that are found in the nucleus of atoms |
| protons | Positively charged elementary particles that are found in nucleus of atoms |
| solid | substance with definite size, shape, and weight and that moves only slightly |
| the 3 states of matter | solid, liquid, or gas |
