4.4.1.2 Mass number, atomic number and isotopes Quiz: AQA Physics, Unit 4

The 20 questions

1. The number of protons in an atom is called its:

   • Isotope number
   • Atomic number
   • Mass number
   • Charge number

2. The mass number of an atom is the total number of:

   • Protons and neutrons
   • Electrons and neutrons
   • Protons and electrons
   • Electrons only

3. In a neutral atom the number of electrons equals the number of:

   • Protons
   • Neutrons
   • Nuclei
   • Isotopes

4. Which subatomic particle is always the same for all atoms of a specific element?

   • Protons
   • Electrons
   • Nucleons
   • Neutrons

5. Isotopes of the same element differ by having a different number of what?

   • Neutrons
   • Protons
   • Electrons
   • Positrons

6. Carbon has atomic number 6 and mass number 12. How many neutrons does a carbon atom have?

   • 3
   • 6
   • 18
   • 12

7. An atom has 11 protons and 12 neutrons. What is its mass number?

   • 23
   • 12
   • 11
   • 1

8. An atom has 8 protons and 10 neutrons. What is its atomic number?

   • 8
   • 18
   • 10
   • 2

9. An atom loses one of its outer electrons. It becomes:

   • A positive ion
   • A neutral isotope
   • A negative ion
   • A neutron

10. What term describes atoms of the same element with different numbers of neutrons?

    • Ions
    • Isomers
    • Isotopes
    • Allotropes

11. A chlorine atom has mass number 35 and atomic number 17. How many neutrons does it have?

    • 17
    • 52
    • 35
    • 18

12. In the notation for helium, ⁴₂He, what is the atomic number?

    • 4
    • 2
    • 6
    • 1

13. What physical property always differs between two isotopes of the same element?

    • Proton count
    • Mass
    • Charge
    • Atomic number

14. Which quantity is the same for all isotopes of an element?

    • Mass number
    • Atomic number
    • Total mass
    • Number of neutrons

15. An ion has 9 protons and 10 electrons. What is its charge?

    • −1
    • +1
    • +9
    • −10

16. A nucleus has a mass number of 27 and an atomic number of 13. How many neutrons does it contain?

    • 13
    • 40
    • 14
    • 27

17. Element X has mass number 40 and atomic number 20. A positive ion of X is formed by losing 2 electrons. How many electrons does the ion have?

    • 22
    • 20
    • 38
    • 18

18. Why do all isotopes of a particular element share the exact same atomic number?

    • Same mass number
    • Same electron count
    • Same proton count
    • Same neutron count

19. An atom has 15 protons, 16 neutrons and 15 electrons. What are its atomic number and mass number?

    • 31 and 15
    • 15 and 31
    • 16 and 31
    • 15 and 16

20. What is always greater than or equal to the atomic number in a stable atom?

    • Mass number
    • Electron number
    • Neutron number
    • Proton number

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