Q1:
How was the plum pudding model different from the hard-sphere model of the atom?
- A The plum pudding model showed electrons making up the corners of a cube.
- B The plum pudding model included negatively charged particles known as electrons.
- C The plum pudding model included positively charged particles known as protons.
- D The plum pudding model described electrons orbiting a central nucleus.
- E The plum pudding model showed electrons occupying different energy levels.
Q2:
Which diagram most closely represents Rutherford’s nuclear or planetary model of the atom?
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A
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B
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C
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D
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E
Q3:
In the Geiger-Marsden experiments supervised by Ernest Rutherford (known as the Rutherford gold foil experiment), which type of particle was scattered by gold foil, proving that atoms contain dense nuclei?
- A particles
- B particles
- C Neutrons
- D Gamma rays
- E particles
Q4:
Which diagram most closely represents Bohr’s electron shell model of the atom?
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A
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B
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C
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D
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E
Q5:
Which of the following ideas was not supported by Dalton’s solid sphere model of the atom?
- A Atoms of the same element are identical.
- B Atoms can be divided into smaller parts.
- C Atoms can chemically combine to form compounds.
- D Atoms of one element are never transformed into atoms of another element.
- E All elements are made of atoms.
Q6:
Which of the following is not true about the gold leaf experiment?
- A Most positively charged 𝛽 particles passed through the foil without being deflected.
- B A very small number of particles were significantly reflected backward.
- C Some α particles were slightly deflected.
- D The α particles used consisted of two protons and two neutrons.
- E Most positively charged α particles passed through the foil without being deflected.
Q7:
James Chadwick proved the existence of .
- A the quantum atomic model
- B the electron cloud model
- C the electron
- D the neutron
- E the proton
Q8:
Which of the following scientists first discovered protons?
- A Thomson
- B Rutherford
- C Chadwick
- D Dalton
- E Bohr
Q9:
What experiment explained the existence of the tiny, negatively charged electrons? Who performed this experiment?
- A Cathode-ray tube experiment, Dalton
- B Cathode-ray tube experiment, Chadwick
- C Gold foil experiment, Rutherford
- D Cathode-ray tube experiment, Thomson
- E Gold foil experiment, Thomson
Q10:
What proposition did Rutherford’s nuclear model of the atom introduce over the plum pudding model?
- A That particles have mass and are of positive charge
- B That particles have mass but no charge
- C That electrons are swimming in a positively charged sphere
- D That a small dense nucleus is in the center of the atom
- E That electron shells are of fixed radii
Q11:
Who first discovered electrons?
- A Geiger and Marsden
- B Thomson
- C Rutherford
- D Dalton
- E Bohr
Q12:
Who first discovered the nucleus?
- A Thomson
- B Rutherford
- C Bohr
- D Dalton
- E Chadwick
Q13:
Which diagram most closely represents Thomson’s plum pudding model of the atom?
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A
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B
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C
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D
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E
Q14:
Who contributed the idea of the electron cloud to the modern quantum mechanical model of the atom?
- A Rutherford
- B Thomson
- C Bohr
- D Dalton
- E Schrödinger
Q15:
Which theory of the atom came first: Rutherford’s nuclear model, Bohr’s orbital model, Dalton’s hard sphere model, or Thomson’s plum pudding model?
- A Thomson’s plum pudding model
- B Dalton’s hard sphere model
- C Bohr’s orbital model
- D Rutherford’s nuclear model
Q16:
Who first postulated the plum pudding model of the atom?
- A Chadwick
- B Dalton
- C Thomson
- D Rutherford
- E Bohr
Q17:
Who first postulated the nuclear model of the atom?
- A Chadwick
- B Bohr
- C Rutherford
- D Thomson
- E Dalton
Q18:
What is the correct order of the following atomic model theories from oldest to newest?
- Thomson’s
- Schrodinger’s
- Dalton’s
- Bohr’s
- Rutherford’s
- A 3, 1, 5, 4, 2
- B 2, 4, 5, 1, 3
- C 3, 1, 5, 2, 4
- D 3, 1, 4, 5, 2
Q19:
Which of the following is not correct about neutrons?
- A They were discovered by James Chadwick.
- B They orbit around the nucleus.
- C The mass of neutrons is slightly greater than the mass of protons.
- D Together with protons they form the atomic mass.
- E They are electrically neutral.
Q20:
Who first postulated the electron shell model of the atom?
- A Thomson
- B Rutherford
- C Chadwick
- D Dalton
- E Bohr
Q21:
What experiment proved the existence of a tiny, dense, positively charged nucleus and who discovered it?
- A Cathode-ray tube experiment, Dalton
- B Cathode-ray tube experiment, Thomson
- C Gold foil experiment, Rutherford
- D Cathode-ray tube experiment, Chadwick
- E Gold foil experiment, Thomson
Q22:
Which of the following is the new model of the atom that replaced Dalton’s hard-sphere model in 1897?
- A Bohr’s electron shell model
- B The cubical model
- C Thomson’s plum pudding model
- D The Saturnian model
- E Rutherford’s model
Q23:
Which chemist discovered that electrons exist at fixed energy levels?
- A Bohr
- B Thomson
- C Dalton
- D Geiger and Marsden
- E Rutherford
Q24:
What proposition did Bohr’s orbital model of the atom introduce over Rutherford’s nuclear model?
- A That particles have mass and are of positive charge
- B That particles have mass but no charge
- C That electrons are swimming in a positively charged sphere
- D That electron shells are of fixed radii
- E That a small dense nucleus is in the center of the atom
Q25:
Who first postulated the solid-sphere model of the atom?
- A Bohr
- B Thomson
- C Rutherford
- D Dalton
- E Geiger and Marsden
