| A | B |
|---|
| nucleus | center of an atom |
| element | a substance made up of only one kind of atom |
| electron | subatomic particle with a negative charge |
| proton | subatomic particle with a positive charge |
| atom | the smallest unit of an element that has all the properties of that element |
| neutron | subatomic particle with no charge |
| Periodic Table | a chart of elements arranged by similar properties and atomic number |
| compound | a substance made up of the atoms of two or more different elements; sugar and table salt are examples |
| molecule | a grouping of two or more atoms joined together |
| mixture | combination of two or more different kinds of matter where substances can be separated; sugar dissolved in water is an example; pepper and water together is another example |
| evaporation | the changing of a liquid (water) to a gas (water vapor) |
| condensation | changing from a gas (water vapor) to a liquid (water) |
| reactivity | the ability of a substance to react chemically |
| matter | anything that has mass and occupies space |
| mass | the amount of matter in an object |
| weight | the pull of gravity on matter |
| solubility | the ability of a substance to dissolve (ex: sugar dissolved in water) |
| physical properties | the characteristics of a substance that can be measured without changing the substance (color, weight, taste, mass, volume, etc.) |
| chemical reaction | changes in which one or more new substances are formed; creates heat, color change, light, a gas |
| attraction between electrons (-) and protons (+) | what holds an atom together |
