Lesson 3.2.1.1

3.2.1.1 Constituents of the atom Quiz: AQA Physics, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.2.1.1, Constituents of the atom: 20 multiple choice questions for the AQA Physics (7408), Unit 2: Particles and radiation, written with Revision Ninja.

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The 20 questions

  1. What is the charge of a proton?

    • +1.6 × 10^-19 C
    • 0 C
    • -1.6 × 10^-19 C
    • +1.6 × 10^-27 C

  2. What is the charge of a neutron?

    • +1 e
    • +2 e
    • zero
    • -1 e

  3. Approximately how does the mass of an electron compare with the mass of a proton?

    • about 1/1840 of the proton mass
    • about 1840 times the proton mass
    • about the same as the proton mass
    • about 1/18 of the proton mass

  4. What is the approximate value of the atomic mass unit in kilograms?

    • 1.66 × 10^-27 kg
    • 9.11 × 10^-31 kg
    • 1.66 × 10^-24 kg
    • 1.60 × 10^-19 kg

  5. What does the nucleon number A represent in nuclide notation?

    • The number of neutrons only
    • The number of electrons in a neutral atom
    • The total number of protons and neutrons in the nucleus
    • The number of protons only

  6. What is the proton number Z of a nucleus?

    • The number of nucleons in the nucleus
    • The number of protons in the nucleus
    • The number of neutrons in the nucleus
    • The total number of electrons in the atom

  7. What are isotopes of an element?

    • Nuclei with the same proton number but different nucleon numbers
    • Nuclei with the same number of neutrons
    • Atoms with different numbers of electrons only
    • Nuclei with the same nucleon number but different proton numbers

  8. How many neutrons are in the nuclide 238 92 U?

    • 92
    • 146
    • 238
    • 330

  9. Carbon-14 and carbon-12 are isotopes. What is the difference between their nuclei?

    • Carbon-14 has two more protons
    • Carbon-14 has two more neutrons
    • Carbon-14 has two more electrons
    • Carbon-14 has a different charge

  10. How many electrons are in the ion 56 26 Fe^2+?

    • 26
    • 24
    • 28
    • 56

  11. What is the specific charge of an alpha particle (4 2 He^2+) given its charge 3.2 × 10^-19 C and mass 6.64 × 10^-27 kg?

    • 4.8 × 10^10 C kg^-1
    • 1.8 × 10^7 C kg^-1
    • 4.8 × 10^7 C kg^-1
    • 2.4 × 10^7 C kg^-1

  12. Which nuclide has a proton number of 20 and 30 neutrons?

    • 50 20 Ca
    • 50 30 Zn
    • 20 30 Ca
    • 30 20 Ca

  13. Chlorine has isotopes Cl-35 and Cl-37 with relative atomic mass 35.5. Roughly what percentage of atoms are Cl-35?

    • 90%
    • 75%
    • 25%
    • 50%

  14. How many electrons does a neutral atom of 7 3 Li have?

    • 7
    • 4
    • 10
    • 3

  15. Which is the specific charge of a proton approximately, in C kg^-1?

    • 1.6 × 10^-19 C kg^-1
    • 1.8 × 10^11 C kg^-1
    • 9.6 × 10^-7 C kg^-1
    • 9.6 × 10^7 C kg^-1

  16. Which of the following is larger, and by roughly what factor: the specific charge of the electron or of the proton?

    • The electron, by a factor of about 1800
    • The electron, by a factor of about 1.8 × 10^6
    • The proton, by a factor of about 1800
    • The electron, by a factor of about 18

  17. What is the total number of protons and electrons in a neutral atom of 40 20 Ca?

    • 40
    • 80
    • 60
    • 20

  18. Neon has 90% of atoms as Ne-20 and 10% as Ne-22. What is its relative atomic mass?

    • 21.0
    • 22.0
    • 20.0
    • 20.2

  19. An ion has 12 protons, 12 neutrons and 10 electrons. Which is its nuclide notation with charge?

    • 12 24 Mg^2+
    • 24 12 Mg^2+
    • 22 10 Ne^2+
    • 24 12 Mg^2-

  20. Which nuclide notation shows a nucleus with 6 protons and 8 neutrons?

    • 6 14 C
    • 8 6 C
    • 14 6 C
    • 6 8 C

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