| A | B |
|---|
| matter | anything that has mass |
| mass | the amount of matter in an object |
| evidence | clues or hints |
| indirect evidence | clues about things we cannot test directly |
| hypothesis | a logical guess |
| atom | basic unit of all matter |
| nucleus | central part of an atom |
| protons | found in the central part of the atom |
| neutron | fond in the nucleus of the atom |
| electron | travel around the nucleus of the atom |
| element | made up of only one kind of atom |
| symbol | short way to write name of an element |
| number of elements | 109 |
| N | nitrogen |
| Cl | chlorine |
| Au | gold |
| Na | sodium |
| Hg | mercury |
| compound | a new substance formed different elements combine |
| molecule | made up of 2 or more atoms |
| formula | a group of symbols and numbers that stand for a compound |
