Question

atomic theory timeline questions and rubric please choose the correct answer to the following questions. use the google form to answer the questions. answer in complete sentences. 1) who discovered the electron? a) dalton b) thomson c) rutherford d) bohr 2) what did rutherford discover in his experiment? a) nucleus b) electrons c) neutrons 3) in which model are atoms are imagined as tiny balls? a) dalton b) thomson c) rutherford d) bohr 4) who proposed a model with electrons moving in specific layers? a) dalton b) thomson c) rutherford d) bohr 5) what does atom mean? a) small b) visible c) indivisible d) particle 6) who is “responsible” for the 2000 - year “death of chemistry”? a) aristotle b) democritus c) thomsen d) dalton 7) rutherford’s “gold - foil” experiment using alpha particle scattering concluded that a) the center of the atom is empty b) atomic mass is spread over the whole atom c) the center of the atom has a negative charge d) most of the atom is empty 8) in which model are atoms are imagined as the solar system? a) dalton b) thomson c) rutherford d) bohr e) cloud model rubric: timeline has a title 4 pts organization of events is neat, clear and chronological 12 pts all pictures, atomic models and analogies of the atom are included and accurate 12 pts correct matching of information boxes with the responsible scientist(s) 12pts poster looks aesthetically pleasing (color, outlining, easy to read and interpret, creative) 8 pts class time is used wisely 4 pts questions #1 - 8 (1/2 point each) 8pts total points earned: / 60

Explanation:

1. J. J. Thomson discovered the electron in his cathode - ray tube experiments.
2. Rutherford discovered the nucleus through his gold - foil experiment.
3. Dalton's atomic model imagined atoms as tiny, indivisible balls.
4. Bohr proposed a model where electrons move in specific layers or energy levels.
5. The word "atom" comes from the Greek word "atomos" meaning indivisible.
6. Aristotle's ideas were dominant for about 2000 years and are considered to have hindered the progress of chemistry during that time.
7. Rutherford's gold - foil experiment concluded that most of the atom is empty space with a small, dense, positively - charged nucleus.
8. Rutherford's atomic model is often compared to the solar system with the nucleus as the sun and electrons as planets.

Answer:

1. b) Thomson
2. a) nucleus
3. a) Dalton
4. d) Bohr
5. c) indivisible
6. a) Aristotle
7. d) most of the atom is empty
8. c) Rutherford