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