5 Atomic theory of Rutherford Thomson Bohr – problems and solutions
1. The weakness of Rutherford’s atomic theory is …
A. The electrons surrounding the atomic nucleus will absorb energy
B. Electrons spread evenly on the surface of the spherical atom
C. Electrons rotate around the core like the solar system
D. Electrons surround the nucleus emitting electromagnetic waves
E. An atom consists of positive and negative charges
Solution
The correct answer is C.
2. One statement about the Thomson atom model is …
A. Electrons can absorb energy
B. Electrons converge to form an atomic nucleus
C. Atom is the smallest part
D. Atoms have a (+) and (-) charge that is evenly distributed
E. The electrons are in the vicinity of the atomic nucleus
Solution
The correct answer is D.
3. Which of the following statements are the weaknesses of Bohr’s atomic theory?
A. Can not explain Zeeman effect
B. Can not explain the centripetal force of electrons
C. Contrary to the laws of classical physics
D. Contrary to Dalton’s theory
E. Can not determine transition energy
Solution
The correct answer is A.
4. The difference of opinion about the atomic model according to Rutherford and Bohr is …
Rutherford | Bohr | |
| A | The atom consists of a positively charged nucleus and a negatively charged electron that travels around the nucleus | The electrons move around the nucleus and the atomic mass is centered at its core |
| B | The electrons surround the nucleus while releasing energy | The electrons surround the nucleus on a certain path |
| C | Electrons in their stationary path absorb energy | Electrons can leaving the path by absorbing/releasing energy |
| D | Electrons are part of a negative electrically charged atom | Electrons are spread in the nucleus of the atom |
| E | The atomic mass is centered on a small location called the nucleus | Mass of atom same in all point in an atom |
Solution
The correct answer is B.
5. The true statement of Rutherford’s atomic model and Bohr’s atomic model is …
Rutherford | Bohr | |
| A | All positive charges and some atomic mass are present in the nucleus of the atom | Electrons cannot move around the nucleus through each passage |
| B | The positive electric charge is neutralized by the electrons scattered between the charges | The electrons of atoms occupy the orbital path called the energy level |
| C | Atom is neutral | The energy of electrons in the atom is expressed by the energy level |
| D | Attractive nuclei and electron nuclei create a centripetal force in electrons that result in the electrons remaining in their orbits | The electrons can move from one orbit (path) to another one by releasing energy or absorbing energy |
| E | The nucleus is surrounded by electrons that rotate on a path like a planet | In one reaction only the electrons on the outside are subject to change while the nucleus does not change |
Solution
The correct answer is D.
