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Topic 3 - The Atomic Structure

1. Historical Development of the modern atomic model: Recalling concept facts

1. In the wave-mechanical model of the atom, the orbital is a region of the most probable location of
2) Neutrons
1) Protons
3) Positrons

4) Electrons

2. According to the wave-mechanical model of the atom, electrons in the atom
1) Travel in defined circle
3) Have a positive charge

2) Are most likely to be found in an excited state 4) Are located in orbital outside the nucleus

3. The modern model of an atom shows that electrons are
1) Orbiting the nucleus in fixed path 3) Combined with neutrons in the nucleus
2) Found in regions called orbital 4) Located in a solid sphere covering the nucleus

4. In the wave-mechanical model, the orbital is a region in space of an atom where there is
1) High probability of finding an electron 3) Circular path in which electrons are found
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2) High probability of finding a neutron 4) Circular path in which neutrons are found

5. The modern model of the atom is based on the work of
1) One Scientist over a short period of time 3) Many Scientists over a short period of time
4) Many scientists over a long period of time
2) One scientist over a long period of time

6. Over the course of the historical development of the modern atomic model, there
1) Has been one proposed model of atom by many Scientists
2) Has been one proposed model of atom by one Scientist
3) Have been many proposed models of atom by many Scientists
4) Have been many proposed models of atom by one Scientist

7. Which conclusion is based on the “gold foil experiment“ and the resulting model of the atom?
1) An atom is mainly empty space, and the nucleus has a positive charge
2) An atom is mainly empty space, and the nucleus has a negative charge
3) An atom has hardly any empty space, and the nucleus is positive charge
4) An atom has hardly any empty space, and the nucleus is negative charge

8. Which group of atomic models is listed in order from the earliest to the most recent?
1) Hard-sphere model, wave-mechanical model, electron-shell model

2) Hard-sphere model, electron-shell model, wave mechanical model
3) Electron-shell model, wave-mechanical model, hard-sphere model
4) Electron-shell model, hard-sphere model, wave-mechanical model

9. Which sequence represents a correct order of historical developments leading to the modern model
of the atom?
1) Atom is a hard sphere --> atom is mostly empty space --> electrons exist in orbital outside the nucleus
2) Atom is a hard sphere --> electrons exist in orbital outside the nucleus --> atom is mostly empty space
3) Atom is mostly empty space --> the atom is a hard sphere --> electrons exist in orbital outside the nucleus
4) Atom is empty space --> electrons exist in orbital outside the nucleus --> the atom is a hard sphere

10. Which order of diagrams correctly shows the historical models of the atom from the earliest to the
most modern?
+ - + + - +

- + -
• - + - •
1) + - + 3) + - +

+ - + + - +

- + -

•
- + - •
+ - +
+ - +
2) 4)
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