6.4.1.2 Mass number, atomic number and isotopes Quiz: AQA Combined Science, Unit 21

The 20 questions

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

   • atomic number
   • nucleon count
   • isotope number
   • mass number

2. The total number of protons and neutrons in an atom is called its:

   • charge number
   • mass number
   • isotope
   • atomic number

3. What is the term for the total number of protons in an atom's nucleus?

   • Neutron number
   • Electron number
   • Atomic number
   • Mass number

4. All atoms of a particular element have the same number of what?

   • Mass numbers
   • Protons
   • Neutrons
   • Total particles

5. What does an atom become when it loses one or more electrons?

   • Isotope
   • Negative ion
   • Positive ion
   • Neutral atom

6. Why does a neutral atom have no overall electrical charge?

   • Electrons equal neutrons
   • Protons equal electrons
   • Protons equal neutrons
   • No subatomic particles

7. Which particle contributes to the mass number but not to the atomic number?

   • Neutron
   • Electron
   • Ion
   • Proton

8. What do isotopes of the same element share?

   • Same physical properties
   • Same neutron number
   • Same mass number
   • Same atomic number

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

   • 12
   • 11
   • 34
   • 23

10. A neutral atom has atomic number 17. How many electrons does it have?

    • 17
    • 18
    • 34
    • 35

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

    • 2
    • 6
    • 14
    • 8

12. An ion has atomic number 9, mass number 19 and 10 electrons. What is its charge?

    • +1
    • +10
    • -10
    • -1

13. Two isotopes of carbon both have 6 protons. One has 6 neutrons and the other 8. What are their mass numbers?

    • 14 and 6
    • 12 and 8
    • 12 and 14
    • 6 and 8

14. An atom has 1 proton and 1 neutron. What is its mass number?

    • 0
    • 3
    • 1
    • 2

15. An element has atomic number 6 and 7 neutrons. What is its mass number?

    • 19
    • 6
    • 7
    • 13

16. What is the mass number of an atom equal to?

    • Protons minus neutrons
    • Protons plus electrons
    • Protons plus neutrons
    • Neutrons plus electrons

17. Which particles are more numerous in a positive sodium ion?

    • Electrons
    • Positrons
    • Protons
    • Neutrons

18. The mass number of an isotope is 37 and it has 17 protons. How many neutrons does it contain?

    • 17
    • 54
    • 37
    • 20

19. What term describes two atoms with identical proton numbers but different neutron numbers?

    • Isotopes
    • Allotropes
    • Isomers
    • Ions

20. What is the atomic number of an atom with 12 protons?

    • 24
    • 0
    • 6
    • 12

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