Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Explaining the trend in the reactivity of the halogens
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →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.
Question 2
5 marks · Hard
Answer and see the solution →This question is about explaining halogen reactivity in terms of electronic configuration.
(a)[1 mark]State, in terms of electron shells, the difference in the position of the outer electrons of a chlorine atom and a bromine atom.
(b)[2 marks]Explain, in terms of electronic configuration, why a chlorine atom is more reactive than a bromine atom.
(c)[1 mark]A chlorine atom reacts to form a chloride ion. Write the electron configuration for the chloride ion.
(d)[1 mark]Using your answers and knowledge of shells, describe what happens, in terms of electrons, when bromine forms a bromide ion.
Question 3
2 marks · Hard
Answer and see the solution →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.