SubjectCover

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

Explaining the trend in the reactivity of the halogens

19 practice questions

Start practising (19 questions)

Practice questions

11–19 of 19

  1. Question 11

    3 marks · Normal

    Explain why astatine is less reactive than bromine, in terms of atomic structure and electronic configuration.

    Answer and see the solution →

  2. Question 12

    4 marks · Normal

    The table shows some properties of Group 7 elements.

    ElementColour at room temperatureState at room temperatureMelting point (°C)
    ChlorineGreenGas-101
    BromineRed-brownLiquid-7
    IodineDark greySolid114
    (a)

    Predict the appearance and physical state of astatine at room temperature.

    [2 marks]
    (b)

    Suggest a melting point for astatine, based on the trend in the table.

    [2 marks]
    Answer and see the solution →

  3. Question 13

    1 mark · Normal

    Which statement best explains why chlorine is more reactive than bromine?

    1. A.Chlorine has a higher nuclear charge than bromine.
    2. B.Chlorine has a smaller atomic radius, so its outer electrons are more strongly attracted to the nucleus.
    3. C.Chlorine forms positive ions more easily than bromine.
    4. D.Chlorine has more energy levels than bromine.
    Answer and check →

  4. Question 14

    2 marks · Normal

    State what you would observe if chlorine water is added to a solution of sodium iodide. Explain your answer.

    Answer and see the solution →

  5. Question 15

    4 marks · Normal

    This question is about how halogens react by gaining electrons.

    (a)

    Describe what happens to a bromine atom when it reacts to form a bromide ion.

    [1 mark]
    (b)

    Explain, using electron arrangement, why it is easier for chlorine to form an ion than bromine.

    [3 marks]
    Answer and see the solution →

  6. Question 16

    3 marks · Normal

    Iodine (I2) is a solid at room temperature, and its melting point is 114 °C. Its colour as a solid is purple-black. Astatine (At) is the element below iodine in Group 7 and has not been isolated, but its properties can be predicted from group trends.

    Predict the following properties of astatine (At2) based on your knowledge of halogen group trends:

    (a)

    State the physical state (solid, liquid or gas) in which astatine would exist at room temperature.

    [1 mark]
    (b)

    Estimate whether the melting point of astatine would be higher or lower than that of iodine. Explain your answer.

    [1 mark]
    (c)

    State and explain what colour (compared to iodine) you would expect astatine to be as a solid.

    [1 mark]
    Answer and see the solution →

  7. Question 17

    2 marks · Hard

    Astatine is the halogen below iodine in Group 7. Predict the colour and state you would expect for astatine at room temperature, based on group trends.

    Answer and see the solution →

  8. Question 18

    5 marks · Hard

    This question is about explaining halogen reactivity in terms of electronic configuration.

    (a)

    State, in terms of electron shells, the difference in the position of the outer electrons of a chlorine atom and a bromine atom.

    [1 mark]
    (b)

    Explain, in terms of electronic configuration, why a chlorine atom is more reactive than a bromine atom.

    [2 marks]
    (c)

    A chlorine atom reacts to form a chloride ion. Write the electron configuration for the chloride ion.

    [1 mark]
    (d)

    Using your answers and knowledge of shells, describe what happens, in terms of electrons, when bromine forms a bromide ion.

    [1 mark]
    Answer and see the solution →

  9. Question 19

    2 marks · Hard

    Astatine is the element below iodine in Group 7 of the Periodic Table.

    Predict the colour and state of astatine at room temperature. Justify your predictions using group trends.

    Answer and see the solution →