Group VII Properties
Overview
The Group VII halogens are a striking family of coloured, reactive non-metals: a pale yellow-green gas, a red-brown liquid and a grey-black solid, all sitting in the same column of the periodic table. They are the mirror image of the Group I metals, with a reactivity that falls, rather than rises, as you go down the group.
In this lesson you will learn the appearance of chlorine, bromine and iodine at room temperature, the trends in density and reactivity, and the displacement reactions that prove the order of reactivity. More than that, you will understand why the trend runs the way it does, so you can predict how an unfamiliar halogen will behave and justify it like an examiner.
Objectives
- [Core] Describe the Group VII halogens, chlorine, bromine and iodine, as diatomic non-metals with general trends down the group, limited to: (a) increasing density (b) decreasing reactivity
- [Core] State the appearance of the halogens at room temperature and pressure, r.t.p., as: (a) chlorine, a pale yellow-green gas (b) bromine, a red-brown liquid (c) iodine, a grey-black solid
- [Supplement] Describe and explain the displacement reactions of halogens with other halide ions
- [Supplement] Predict the properties of other elements in Group VII, given information about the elements
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Lesson Evaluation
Congratulations on completing the lesson on Group VII Properties. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- What is the appearance of bromine at room temperature and pressure? A. Pale yellow-green gas B. Red-brown liquid C. Grey-black solid D. Colourless gas Answer: B
- Going down Group VII, the reactivity: A. Increases B. Decreases C. Stays the same D. Becomes zero Answer: B
- Which halogen will displace iodine from potassium iodide solution? A. Iodine itself B. Astatine C. Chlorine D. None of them Answer: C
- Why does iodine not displace chlorine from sodium chloride solution? A. Iodine is a solid B. Iodine is less reactive than chlorine C. Chlorine is a gas D. They do not dissolve Answer: B
- Going down Group VII, the density: A. Increases B. Decreases C. Stays the same D. Becomes negative Answer: A
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