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Name: ___________________________
Atomic model worksheet
1. Where did Rutherford believe the protons were found?
______________________, are they actually found there? _______________
2. Where did Rutherford believe the electrons were found?
_____________________, are they actually found there? ________________
3. How did Bohr improve Rutherford’s model?
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4. What is the maximum number of electrons orbit 1 can hold? __________ Orbit 2
_________ Orbit 3___________ and orbit 4 ____________
5. Where would the number of protons be located on a periodic table?
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6. How can you determine the number of electrons a neutral atom has?
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7. If oxygen has 8 protons, how many electrons would it have? ______________
8. When do you know to use the next orbital when placing the electrons?
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9. Make a Bohr-Rutherford model for the following elements:
Aluminum
Nitrogen
Argon
Hydrogen
Calcium
Sodium
10. Rutherford modified the atomic model after doing experiments where alpha
particles were dispersed be a sheet of gold foil. Consider the following statements:
1- The number of protons is equal to the number of electrons
2- Protons are concentrated in a small positive space at the center of the atom
3- Atoms consist of mostly empty space
4- Electrons are contained in a positive sphere made up of protons
5- Electrons move about in specific energy levels
Which of these statements are based on Rutherford’s experiments?
A) 1 and 2
B) 1 and 4
C) 2 and 3
D) 3 and 5
11.The diagram, illustrates an experiment conducted using a cathode ray tube.
Which of the following conclusions is supported by this experiment?
A) Cathode rays are negatively charged.
B) Cathode rays are composed of tiny moving particles.
C) Cathode rays travel in a straight line.
D) Cathode rays behave like light rays.
12. The following four statements refer to Democritus’ discontinuous model and
Aristotle’s continuous model.
1) Matter consists of tiny particles that cannot be divided.
2) Matter is made up of four elements (earth, water, fire and air).
3) Matter consists of separate particles.
4) Matter fills the entire space it occupies.
Which of the above statements were made by Democritus?
A) 1 and 2
B) 2 and 4
C) 1 and 3
D) 3 and 4
13. The discontinuous theory states that matter consists of tiny indivisible particles called
atoms.
Which of the following men was the first to propose this theory?
A) Aristotle
B) Democritus
C) Dalton
D) Rutherford
14. What enabled Thomson to draw his conclusion?
A) A series of experiments with radioactive alpha particles directed at a sheet of gold foil
400 atoms thick
B) Extensive experimentation with a 19& century scientific curiosity the cathode ray tube
and a source of electric current
C) An oil-drop experiment that involved tiny droplets of oil falling through a hole covered
with a positively charged plate
D) Calculations based on experimentation showing the behaviour of excited electrons
15. Which of the following characteristics Thomson’s atomic model?
1- Electrons revolve around the nucleus
2- The mass of the atom is concentrated in the nucleus
3- Atoms can lose or gain electrons
4- An atom is completely empty
5- An atom is a positively charged sphere containing negative particles
6- Electrons move within energy level
A) 1 and 3
B) 2 and 4
C) 3 and 5
D) 4 and 6
16. In Rutherford's experiment, a beam of alpha particles was directed at a very thin
sheet of gold, as illustrated below.
What can be concluded from Rutherford's experiment?
1. Electrons circulate in energy levels.
2. Atoms can lose or gain electrons.
3. An atom is mostly empty space.
4. The nucleus of an atom consists of protons.
A) 1 and 2
B) 2 and 4
C) 1 and 3
D) 3 and 4
17. Which of the following is a characteristic common to both the Thomson and
Rutherford models of the atom?
A) The positive charges are in a nucleus
B) The negative charges are evenly distributed throughout the atom
C) The electrons revolve around the nucleus
D) The nucleus is made up of protons and neutrons
18. Rutherford modified the atomic model after doing experiments where alpha
particles were dispersed be a sheet of gold foil. Consider the following statements:
1- The number of protons is equal to the number of electrons
2- Protons are concentrated in a small positive space at the center of the atom
3- Atoms consist of mostly empty space
4- Electrons are contained in a positive sphere made up of protons
5- Electrons move about in specific energy levels
Which of these statements are based on Rutherford’s experiments?
A) 1 and 2
B) 1 and 4
C) 2 and 3
D) 3 and 5
19. Which of the following characteristics describe the simplified atomic model?
1- The number of electrons is equal to the number of protons
2- The number of protons is equal to the number of neutrons
3- The nucleus is made up of neutrons, protons and electrons
4- The nucleus is made up of protons and neutrons
5- Protons revolve around the nucleus
6. Electrons revolve around the nucleus
A) 2, 5 and 7
B) 1, 4 and 6
C) 1, 2 and 3
D) 1, 5 and 7
20. Which of the following diagrams represents the simplified atomic model of the
phosphorus atom, P?
21. Make a Rutherford-Bohr model and a simplified atomic model for sulfur, magnesium,
argon and calcium
22. Who was responsible for the following theories?
A- Atoms of the same element are identical
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B- The atom is made up of mostly empty space
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C- Electrons were found on orbitals which were continually moving
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D- Atoms existed but were all the same size
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E- Matter had no gaps
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F- Atoms of different elements are different
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G- The atom was a positive sphere with electrons inside of it
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H- The nucleus was very small and positively charged
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I- You can combine 2 elements and make a new substance
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J- Matter was discontinuous
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K- An atom was electrically neutral
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L- Neutrons were in the nucleus
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