| A | B |
|---|
| Who was the scientist that believed that atoms joined together to form different materials? | Dalton, 1803 |
| The word atom comes from a Greek word meaning_____. | Indivisible |
| What does Dalton's Theory State? | Atoms cannotbe created, divided, or destroyed |
| Atoms of different elements are exactly alike. | False |
| J. J. Thomsondiscovered that there were small particles insidetheatom. | True |
| In J. J. Thomson's "plum-pudding" mode of the atom, electrongs are NOT___. | Collected together inthecenter of the atom |
| What did Dalton do in developinghis atomic theory that Democritus did not do? | Perform experiments |
| In an experiment, which scientist expected the particles to pass through the gold foil? | Rutherford,1911 |
| In which Atomic Theory can the paths of the electrons Not be predicted? | Modern Atomic Theory |
| ________ are regions inside atoms where electrons are likelyto be found. | Electron Clouds |
| In what part of an atom is most of its mass located? | Nucleus |
| This scientist conducted the cathode-ray tube experiment. | Thomson, 1897 |
| This scientiest believed that elements combined in specific proportions. | Dalton, 1803 |
| This scientist said that atoms are uncuttable. | Democritus, 440 B. C. |
| Which scientist felt that atoms was mostly empty space? | Rutherford, 1911 |
| Which scientist believed that the electrons in atoms jumped between levels from path to path? | Bohr, 1913 |
| Scientist are able to develop theories about dinosaurs and atoms only through _____ evidence. | Indirect |
| The two types of charges are positive and neutral. | False |
| An explanation that is supported by testing and brings together a broad rangeof hypotheses and observations is called____. | Theory |
| Objects with the same charge attract each other. | False |
| In Bohr's atomic model, the electrons did travel in definite paths around the ____. | Nuclcleus |
| The SI unit used to express the masses of particles in atoms. | Atomic mass unit |
| The number of protons in the nucleus of an atom. | Atomic number |
| The particles of the nucleus that has no charge. | Neutrons |
| The negatively charged particles in an atom. | Electrons |
| The positively charged particles of the nucleus. | Protons |
| The smallest particle into which an element can be divided and still be that same substance. | Atom |
| A representation of an object or system. | Model |
| The tiny dense positively charged center of an atom. | Nucleus |
