| A | B |
|---|
| Democritus | first to talk about atoms, a particle too small to divide |
| Aristotle | believed you could always divide a piece |
| John Dalton | father of modern atomic theory |
| J. J. Thomson | discovered electrons using cathode ray tube |
| Ernest Rutherford | discovered the nucleus with Gold Foil Experiment |
| Neils Bohr | believed electrons fell into specific orbits |
| Today's atomic theory | say electrons are found in clouds around the nucleus |
| atoms | smallest part of an element |
| electrons | negatively charged particles |
| nucleus | positively charged center of the atom |
| Dalton's Theory | atoms make up everything, form componuds, & atoms of each element are alike |
| All matter has: | mass and volume |
| 4 Stages of matter are : | solid, liquid, gas, plasma |
| Smallest unit of matter that still retains all characteristics | atom |
| John Dalton gave us the : | Atomic theory |
| Rutherford said an atom was: | mostly space |
| Thompson said the atom resembled a: | plum pudding |
| mass and volume make up all: | matter |
| These have a positive charge in the atom | protons |
| These have a negative charge in the atom | electrons |
| These have no charge in the atom | nutrons |
| An alpha particle has a _____ charge | positive |
| "Atmos" means | can not be divided |
| The nucleus of an atom contains | protons and nutrons |
| This part of the atom has no mass | electron |
