| A | B |
|---|
| atom | the smallest particle of an element that has properties of that element |
| compound | substance made up of two or more elements that are chemically joined, or linked |
| element | basic kind of matter made up of just one kind of atom |
| molecule | two or more atoms combined-smalles particles of matter |
| periodic table | contains names /information about elements |
| expand | caused by heat: molecules move faster,take up more space,are farther apart |
| contract | caused by cold:moleules move slowly, take up less space, closer together |
