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

Atomic Structure

108 practice questions

Start practising (44 questions)

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Practice questions

21–30 of 44 · Easy

  1. Question 21

    3 marks · Easy

    The table shows the isotopes of element Z and their percentage abundances:

    Isotopes of Z
    IsotopeRelative MassPercentage Abundance
    Z-313160
    Z-323240
    (a)

    Calculate the relative atomic mass of Z. Give your answer to one decimal place.

    [2 marks]
    (b)

    Which isotope of Z is most abundant?

    [1 mark]
    Answer and see the solution →

  2. Question 22

    1 mark · Easy

    State the similarity between all isotopes of nitrogen.

    Answer and see the solution →

  3. Question 23

    3 marks · Easy

    Below is information about two isotopes of lithium: Isotope 1: ^{6}Li, abundance 8%. Isotope 2: ^{7}Li, abundance 92%.

    (a)

    Write the equation for calculating the relative atomic mass of lithium using these data.

    [1 mark]
    (b)

    Calculate the relative atomic mass of lithium to one decimal place.

    [2 marks]
    Answer and see the solution →

  4. Question 24

    2 marks · Easy

    A sample contains atoms of oxygen-16 () and oxygen-18 (). Both are isotopes of oxygen.

    State the number of protons and the number of neutrons in an atom of .

    Answer and see the solution →

  5. Question 25

    1 mark · Easy

    State the number of electrons in a neutral atom of lithium, which has an atomic number of 3.

    Answer and check →

  6. Question 26

    3 marks · Easy

    (a)

    State what is meant by the atomic number of an atom.

    [1 mark]
    (b)

    Draw a table to show the number of electrons in each of the following neutral atoms:

    ElementAtomic number
    Beryllium4
    Fluorine9
    [2 marks]
    Answer and see the solution →

  7. Question 27

    2 marks · Easy

    Calcium has an atomic number of 20. Calculate the number of electrons in a neutral atom of calcium. Show your working.

    Answer and see the solution →

  8. Question 28

    2 marks · Easy

    Explain why a neutral atom of aluminium (atomic number 13) also contains 13 electrons.

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  9. Question 29

    3 marks · Easy

    The table below shows the atomic numbers for four elements.

    ElementAtomic number
    Phosphorus15
    Sodium11
    Nitrogen7
    Argon18
    (a)

    For each element, state the number of electrons in its neutral atom.

    [2 marks]
    (b)

    Explain briefly how you worked out your answers.

    [1 mark]
    Answer and see the solution →

  10. Question 30

    1 mark · Easy

    What is the number of electrons in a neutral atom of silicon, which has atomic number 14?

    Answer and check →