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How the model of the atom changed over time

8th grade (Year 9 in England) · 11 questions · Common Core: NGSS.HS-PS1-8, NGSS.SEP 7 · England: GCSE Combined Science: Atomic structure (development of the model of the atom)

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Score/ 11

1
Question 1
A very few alpha particles bounced back from the gold foil. What did this show?
- A. There is a tiny, dense, positively charged nucleus
- B. Electrons are heavy
- C. The foil had holes
- D. Atoms are spread evenly with positive charge
2
Question 2
Models of the atom: which statement is NOT true?
- A. The nucleus is tiny compared with the whole atom.
- B. Scientific models change when new evidence is found.
- C. Bohr's model put electrons in shells at fixed distances.
- D. In the plum pudding model, electrons orbit a nucleus.
3
Question 3
Why did scientists replace the plum pudding model?
- A. New experimental evidence did not fit it
- B. It was too complicated
- C. Thomson asked them to
- D. Plums were unpopular
4
Question 4
Models of the atom: which statement is NOT true?
- A. Rutherford discovered the neutron.
- B. Bohr's model put electrons in shells at fixed distances.
- C. Scientific models change when new evidence is found.
- D. The nucleus is tiny compared with the whole atom.
5
Question 5
Why did scientists replace the plum pudding model?
- A. It was too complicated
- B. Thomson asked them to
- C. New experimental evidence did not fit it
- D. Plums were unpopular
6
Question 6
Models of the atom: which statement is NOT true?
- A. The nucleus is tiny compared with the whole atom.
- B. Scientific models change when new evidence is found.
- C. The electron was discovered before the nucleus.
- D. Most of the mass of an atom is in its electrons.
7
Question 7
Why did scientists replace the plum pudding model?
- A. Thomson asked them to
- B. It was too complicated
- C. New experimental evidence did not fit it
- D. Plums were unpopular
8
Question 8
Models of the atom: which statement is NOT true?
- A. Most of the mass of an atom is in its electrons.
- B. The nucleus is tiny compared with the whole atom.
- C. Bohr's model put electrons in shells at fixed distances.
- D. Scientific models change when new evidence is found.
9
Question 9
Why did scientists replace the plum pudding model?
- A. New experimental evidence did not fit it
- B. It was too complicated
- C. Plums were unpopular
- D. Thomson asked them to
10
Question 10
Models of the atom: which statement is NOT true?
- A. Bohr's model put electrons in shells at fixed distances.
- B. Scientific models change when new evidence is found.
- C. The electron was discovered before the nucleus.
- D. In the plum pudding model, electrons orbit a nucleus.
11
Question 11
In Rutherford's experiment, most alpha particles went straight through thin gold foil. What did this show?
- A. Gold has no electrons
- B. Alpha particles are negative
- C. Atoms are solid spheres
- D. Most of the atom is empty space

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Answer key: How the model of the atom changed over time

1. A. There is a tiny, dense, positively charged nucleus
2. D. In the plum pudding model, electrons orbit a nucleus.
3. A. New experimental evidence did not fit it
4. A. Rutherford discovered the neutron.
5. C. New experimental evidence did not fit it
6. D. Most of the mass of an atom is in its electrons.
7. C. New experimental evidence did not fit it
8. A. Most of the mass of an atom is in its electrons.
9. A. New experimental evidence did not fit it
10. D. In the plum pudding model, electrons orbit a nucleus.
11. D. Most of the atom is empty space