5.1.1.5 Size and mass of atoms Quiz: AQA Combined Science, Unit 8

The 20 questions

1. What is the approximate radius of an atom?

   • About 0.5 nm (5 × 10⁻¹⁰ m)
   • About 0.01 nm (1 × 10⁻¹² m)
   • About 0.1 nm (1 × 10⁻¹⁰ m)
   • About 0.2 μm (2 × 10⁻⁷ m)

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

   • Spread evenly
   • In the shells
   • In the electrons
   • In the nucleus

3. Roughly how does the radius of a nucleus compare to its atom?

   • Less than 1/10 000
   • More than double
   • Equal to
   • About half

4. What is the approximate radius of a nucleus?

   • About 1 × 10⁻¹⁷ m
   • About 1 × 10⁻¹⁰ m
   • About 1 × 10⁻¹⁴ m
   • About 1 × 10⁻⁸ m

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

   • Mass number
   • Atomic number
   • Relative atomic mass
   • Electron count

6. Atoms of the same element that have different numbers of neutrons are called:

   • Isotopes
   • Ions
   • Isomers
   • Allotropes

7. Which subatomic particle has the smallest relative mass?

   • Proton
   • Neutron
   • Electron
   • Alpha particle

8. Which particle has no electric charge?

   • Neutron
   • Ion
   • Electron
   • Proton

9. An atom has atomic number 11 and mass number 23. How many neutrons does it contain?

   • 12
   • 34
   • 23
   • 11

10. An ion has 9 protons, 10 neutrons and 10 electrons. What is its mass number?

    • 20
    • 19
    • 10
    • 9

11. A neutral atom has 17 protons and a mass number of 35. How many electrons does it have?

    • 35
    • 52
    • 17
    • 18

12. Ion X²⁺ has 12 protons and 12 neutrons. How many electrons does it have?

    • 24
    • 14
    • 12
    • 10

13. An atom has mass number 40 and 20 neutrons. What is its atomic number?

    • 10
    • 60
    • 40
    • 20

14. A nucleus has a radius of 1 × 10⁻¹⁴ m and its atom has a radius of 1 × 10⁻¹⁰ m. How many times larger is the atom?

    • 100 times
    • 10 000 times
    • 1 000 000 times
    • 1 000 times

15. Express 1 nm in metres in standard form.

    • 1 × 10⁻¹² m
    • 1 × 10⁻⁹ m
    • 1 × 10⁻⁶ m
    • 1 × 10⁻⁸ m

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

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

17. An atom has 6 protons and 8 neutrons. What is its mass number?

    • 2
    • 14
    • 6
    • 8

18. What differs between isotopes of the same element?

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

19. A chlorine-37 atom has 17 protons. How many neutrons does it contain?

    • 17
    • 20
    • 37
    • 18

20. A boron atom (atomic number 5) has mass number 11. How many electrons does the B³⁺ ion have?

    • 5
    • 2
    • 8
    • 3

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