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

Atomic Structure

108 practice questions

Start practising (16 questions)

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Practice questions

11–16 of 16 · Hard

  1. Question 11

    5 marks · Hard

    The table below gives information about three elements.

    Atomic number of elements
    ElementAtomic number
    A7
    B12
    C15
    (a)

    State the number of electrons in a neutral atom of element B.

    [1 mark]
    (b)

    Element C is found in a rock sample containing 5 atoms. Calculate the total number of electrons in all these atoms.

    [2 marks]
    (c)

    Explain why a neutral atom of element A contains the same number of electrons as its atomic number.

    [2 marks]
    Answer and see the solution →

  2. Question 12

    2 marks · Hard

    Cobalt has an atomic number of 27.

    Give the number of electrons in a neutral atom of cobalt and explain your answer.

    Answer and see the solution →

  3. Question 13

    2 marks · Hard

    A neutral atom of silver has an atomic number of 47 and a mass number of 108. Calculate the number of electrons and neutrons in this atom.

    Answer and see the solution →

  4. Question 14

    5 marks · Hard

    Molybdenum (Mo) is an element with an atomic number of 42. One isotope of molybdenum has a mass number of 98.

    (a)

    State the number of protons in an atom of this isotope.

    [1 mark]
    (b)

    Calculate the number of neutrons in this isotope.

    [2 marks]
    (c)

    Explain how you would determine the number of electrons in a neutral atom of molybdenum.

    [2 marks]
    Answer and see the solution →

  5. Question 15

    2 marks · Hard

    The symbol for antimony is Sb. An atom of antimony has 51 protons and a mass number of 123. State the number of electrons and calculate the number of neutrons in a neutral atom of antimony.

    Answer and see the solution →

  6. Question 16

    9 marks · Hard

    The Periodic Table symbol for the element bromine (B r) is shown below.

    SymbolMass numberNameAtomic number
    Br80Bromine35

    Bromine has two main isotopes: B r-79 and B r-81.

    (a)

    State the meaning of atomic number and mass number.

    [2 marks]
    (b)

    For a neutral atom of bromine-80, calculate the number of:

    (i)

    protons

    [1 mark]
    (ii)

    neutrons

    [2 marks]
    (iii)

    electrons

    [1 mark]
    (c)

    Describe the relative mass and charge of each sub-atomic particle found in a bromine atom.

    [3 marks]
    Answer and see the solution →