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Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter

Atomic Structure

108 practice questions

Start practising (44 questions)

Topics covered

Practice questions

31–40 of 44 · Easy

  1. Question 31

    3 marks · Easy

    (a)

    Complete the following sentence: An atom is neutral because...

    [1 mark]
    (b)

    Potassium has atomic number 19. State the number of electrons in a neutral atom of potassium.

    [1 mark]
    (c)

    Explain your answer to part (b).

    [1 mark]
    Answer and see the solution →

  2. Question 32

    2 marks · Easy

    Show how you would calculate the number of electrons in a neutral atom of argon, given its atomic number is 18.

    Answer and see the solution →

  3. Question 33

    1 mark · Easy

    State the number of protons in a sodium atom.

    Answer and see the solution →

  4. Question 34

    3 marks · Easy

    (a)

    State the number of electrons in a potassium atom.

    [1 mark]
    (b)

    State the number of neutrons in a potassium-39 atom.

    [1 mark]
    (c)

    State the number of protons in a potassium atom.

    [1 mark]
    Answer and see the solution →

  5. Question 35

    2 marks · Easy

    An atom of aluminium has a mass number of 27 and an atomic number of 13.

    Calculate the number of neutrons in an aluminium atom.

    Answer and see the solution →

  6. Question 36

    2 marks · Easy

    Explain why the number of electrons in an atom must always equal the number of protons.

    Answer and see the solution →

  7. Question 37

    3 marks · Easy

    The table below shows information for three elements:

    ElementSymbolAtomic numberMass number
    BoronB511
    SiliconSi1428
    ArgonAr1840

    Complete the following table by giving the number of protons, neutrons and electrons for each atom.

    Answer and see the solution →

  8. Question 38

    1 mark · Easy

    What is the number of electrons in a neutral atom of chlorine?

    Answer and see the solution →

  9. Question 39

    3 marks · Easy

    (a)

    State the number of protons in an atom of magnesium-24.

    [1 mark]
    (b)

    State the number of electrons in an atom of magnesium-24.

    [1 mark]
    (c)

    Calculate the number of neutrons in magnesium-24.

    [1 mark]
    Answer and see the solution →

  10. Question 40

    2 marks · Easy

    Give the number of neutrons in a bromine atom with mass number 79 and atomic number 35.

    Answer and see the solution →