| A | B |
|---|
| element | a substance that cannot be broken down into other substances by heat, light, or electricity |
| periodic table | a chart that classifies elements by properties |
| atom | the smallest particle of an element that has the properties of the element |
| nucleus | the center of an atom, where protons and neutrons are located |
| proton | particle in an atom that has a positive electrical charge |
| neutron | particle in an atom that has no charge |
| electron | particle in an atom that has a negative electrical charge |
| molecule | two or more atoms joined together; the smallest unit of many substances |
| compound | a substance made up of atoms of more than one element |
| mixture | two or more substances that are mixed together, but can be separated out because their atoms are not combined |
| solution | a mixture in which substances break up into their most basic particles, which are too small to be seen, and spread evenly through another substance |
| physical property | a way of describing an object using traits that can be observed or measured without changing the substance into something else |
| physical change | a change in one or more physical properties |
| chemical property | describes the way a substance reacts with other substances |
| chemical change | a change that produces new substances with new properties |
| chemical reaction | a process that produces one or more substances that are different from the original substances |
