Lesson 4.1.1.5

4.1.1.5 Size and mass of atoms Quiz: AQA Chemistry, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.1.1.5, Size and mass of atoms: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 1: Atomic structure and the periodic table, written with Revision Ninja.

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The 20 questions

  1. What is the approximate radius of an atom?

    • About 0.1 nm
    • About 1 m
    • About 10 nm
    • About 1 mm

  2. What fraction of an atom's radius is the nucleus radius?

    • About one tenth
    • Exactly half
    • Less than 1/10 000
    • More than 90%

  3. Where is almost all of the mass of an atom located?

    • The electron cloud
    • Distributed evenly
    • The nucleus
    • The outer shell

  4. The sum of protons and neutrons in an atom is called its:

    • Atomic number
    • Relative charge
    • Mass number
    • Electronic structure

  5. Atoms of the same element with different numbers of neutrons are called:

    • Compounds
    • Allotropes
    • Isotopes
    • Ions

  6. An atom has atomic number 6 and mass number 12. How many neutrons does it have?

    • 0
    • 6
    • 18
    • 12

  7. An atom has mass number 23 and atomic number 11. How many neutrons are there?

    • 11
    • 12
    • 23
    • 34

  8. An ion has mass number 40, atomic number 20 and 18 electrons. How many neutrons does it have?

    • 18
    • 20
    • 22
    • 40

  9. An atom has 15 protons and 16 neutrons. What is its mass number?

    • 16
    • 31
    • 30
    • 15

  10. What is the approximate radius of an atomic nucleus in metres?

    • 1 x 10 to the power -2 m
    • 1 x 10 to the power -10 m
    • 1 x 10 to the power -14 m
    • 1 x 10 to the power -8 m

  11. What does the SI prefix nano represent?

    • One thousandth
    • One millionth
    • One trillionth
    • One billionth

  12. What is the approximate radius of a typical atom?

    • 1 cm
    • 100 nm
    • 0.1 nm
    • 1 mm

  13. Why do isotopes of the same element react identically?

    • Same electronic structure
    • Identical mass number
    • Same neutron number
    • Same total mass

  14. What is the mass number of an atom with 17 protons and 18 neutrons?

    • 18
    • 35
    • 52
    • 17

  15. A nuclide is written with mass number 37 above and atomic number 17 below. Which atom is this?

    • Chlorine-17
    • Argon-37
    • Chlorine-37
    • Potassium-37

  16. An isotope of carbon has mass number 14. How many neutrons does it have?

    • 20
    • 6
    • 14
    • 8

  17. What property differs between isotopes of the same element?

    • Neutron number
    • Proton number
    • Electron number
    • Atomic number

  18. Where is almost all of the mass of an atom concentrated?

    • Electron shell
    • Nucleus
    • Entire atom
    • Orbitals

  19. Which SI unit with a prefix is used to measure atomic radius?

    • Millimetres
    • Micrometres
    • Kilometres
    • Nanometres

  20. Which isotope contains more neutrons: chlorine-35 or chlorine-37?

    • Neither has neutrons
    • Chlorine-37
    • Chlorine-35
    • Both have equal

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