| A | B |
|---|
| atom | The building block of matter |
| compound | A substance formed when atoms of two or more elements join together |
| electron | A tiny, negatively charged particle of an atom that moves around the nucleus |
| element | Matter that has only one kind of atom |
| gas | Form of matter that has no definite shape or volume |
| liquid | Form of matter that has a definite volume but no definite shape |
| matter | Anything that has mass and takes up space |
| model | A picture, and idea, or an object that is built to explain how something else looks or works |
| molecule | The smallest particle of a substance that has the same properties as the substance |
| natural element | An element that is found in nature |
| neutron | A tiny, uncharged particle in the nucleus of an atom that is similar in size to a proton |
| nucleus | The central part of an atom that holds the protons and neutrons |
| property | A charactistic that helps identify an object |
| proton | A tiny, charged particle in the nucleus of an atom |
| solid | Form of matter that has a definite shape and volume |
| state of matter | The form that matter has--solid, liquid, or gas |
| symbol | One or two letters that represent the name of an element |
