| A | B |
|---|
| matter | Anything that has mass and occupies space |
| mass | a measure of the amount of matter in an object |
| volume | a measure of how much space an object takes up |
| atom | the smallest unit of an element that still keeps the properties of that element |
| boiling point | the particular temperature for each substance at which it changes state from a liquid to a gas |
| density | a measure of how tightly packed the matter of an object is |
| electron | a negatively charged particle that moves around the nucleus of an atom at the speed of light |
| molecule | two or more elements that are chemically combined |
| nucleus | the dense center of an atom that has protons and neutrons |
| proton | a positively charged particle in the nucleus of an atom |
| state of matter | one of the three forms that matter can take - solid, liquid, or gas |
| weight | the force of gravity between Earth and an object |
| solid | a state of matter in which molecules are packed tightly in an organized way |
| liquid | a state of matter in which molecules are separated from one another and that takes on the shape of its container |
| gas | a state of matter in which molecules are moving very fast and in a disorganized way |
| neutron | a particle in the nucleus of an atom that has no electrical charge |
