| A | B |
|---|
| matter | anything that has mass and takes up space |
| atom | the smallest particle that makes up most types of matter |
| law of conservation | states that matter cannot be created nor destroyed, it only changes form |
| Thomson | he discovered the electron |
| electron | invisible, negatively charged particles that surrounds nucleus of an atom |
| Rutherford | discovered the proton and nucleus of an atom |
| nucleus | the positively charged central part of an atom |
| Chadwick | discovered the neutron |
| neutron | uncharged particles found within the nucleus of an atom |
