| A | B |
|---|
| anything that has mass and takes up space | matter |
| the amount of matter in something, measured in grams | mass |
| the amount of space something takes up, measured in liters of cubic centimeters | volume |
| the smallest parts of something that can be identified | atoms |
| very small pieces of something | particles |
| the particles in the nucleus of an atom that have a positive charge | protons |
| the particles in the nucleus of an atom that have no charge | neutrons |
| particles that move around the nucleus of an atom and have a negative charge | electrons |
| the center of an atom | nucleus |
| having an equal number of positive and negative charges | neutral |
| a substance that cannot be split into simpler substances | element |
| any substance made of two or more atoms | molecule |
| matter made by two or more elements that cannot be separated physically | compounds |
| a process in which atoms gain, lose, or share electrons | chemical reactions |
| a combination of two or more substances that can be separated physically | mixture |
