Rutherford hypothesizes atomic nucleus
- 1. Who proposed the model of the atomic nucleus?
A) Niels Bohr
B) Marie Curie
C) Ernest Rutherford
D) J.J. Thomson
- 2. In Rutherford's model, most of the atom's mass is concentrated in the _________.
A) nucleus
B) orbital shells
C) valence electrons
D) electron cloud
- 3. Which experiment led Rutherford to propose the atomic nucleus?
A) Photoelectric effect experiment
B) Oil drop experiment
C) Cathode ray tube experiment
D) Gold foil experiment
- 4. The nucleus of an atom contains _________.
A) quarks and leptons
B) electrons and positrons
C) protons and neutrons
D) photons and neutrinos
- 5. What does the number of protons in the nucleus determine for an element?
A) isotopic mass
B) atomic number
C) valence electrons
D) atomic mass
- 6. Which subatomic particle is not found in the nucleus according to Rutherford's model?
A) quarks
B) electrons
C) neutrons
D) protons
- 7. What properties of an atom are determined by the arrangement of electrons in the electron cloud?
A) nuclear properties
B) thermal properties
C) mass properties
D) chemical properties
- 8. The concept of isotopes can be explained by the presence of _________ in the nucleus.
A) antiprotons
B) positrons
C) neutrons
D) muons
- 9. The stability of a nucleus is influenced by the balance between ________ and ________.
A) centrifugal force, frictional force
B) electric force, magnetic force
C) strong nuclear force, electromagnetic force
D) gravity, weak nuclear force
- 10. The total number of protons and neutrons in the nucleus is referred to as the ________ number.
A) elemental
B) charge
C) mass
D) atomic
- 11. Which type of radiation is stopped by a thin sheet of paper?
A) gamma
B) alpha
C) beta
D) neutron
- 12. What is the process by which a nucleus splits into smaller fragments called?
A) alpha decay
B) nuclear fusion
C) nuclear fission
D) beta decay
- 13. Which nuclear reaction powers the sun and other stars?
A) alpha decay
B) nuclear fission
C) beta decay
D) nuclear fusion
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