| A | B |
|---|
| chemical formula | made up of symbols and numbers that tell what elements are in a compound and what their ratios |
| compound | a form of matter that is made when two or more elements combine |
| electron | a particle with a negative electric charge |
| element | matter made up of only one type of atom |
| matter | anything that has mass and takes up space |
| neutron | a particle with no charge at all |
| mixture | if two or more substances are put together but do not combine to make a compound |
| atom | a small particle that makes up most types of matter |
| proton | a particle with a positive charge |
| periodic table | a chart that organizes elements by the number of protons in each element's nucleus |
