| A | B |
|---|
| matter | anything that has mass and takes up space |
| atom | smallest unit of matter |
| element | contain one tyupe of atom , ex H |
| proton | positively charged particle, inside nucleus |
| neutron | particle with no charge, inside nucleus |
| electron | negatively charged particle, outside nucleus |
| mass number | the total of protons and neutrons in nucleus |
| atomic number | the amount of protons in atoms |
| isotope | atoms of same element, differ in neutron number |
| molecule | combined atoms, ex H2O |
| compound | type of matter, has properties of different from properties of each of the elements in it. |
| chemical property | describes how one substance changes when it reacts with other substances, ex. rusty nail |
| ion | electrically charged atoms |
| mixture | example, pencils, books, papers |
| solution | made of solvent and solute |
