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