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Year 11 - Science

Properties of Group 7

Groups of the periodic table

Unit Summary

This unit explores how elements' reactions are related to electron arrangement and atomic number. It covers the properties of Groups 1, 7, and 0 and explains how these depend on outer electrons. It also predicts element reactivity and reactions based on their positions in the periodic table.

Lesson Summary

You will learn to describe patterns in the properties of group 7 elements and explain how these are determined by their electron structures.

Key Notes

  • Group 7 elements are very reactive and their reactivity decreases down the group.
  • Moving down Group 7 elements, atomic mass, density, and melting and boiling points increase.
  • In chemical reactions, atoms of Group 7 elements gain one outer electron making just full electron shells.
  • Going down Group 7, the force attracting an extra electron reduces with the distance of each shell from the nucleus.
  • Halogens are elements, halides are salts.

Vocabulary To Learn

  • salts: are ionic compounds formed from positive and negative ions electrostatically attracted to each other.
  • halogens: are reactive non-metallic elements in Group 7 of the periodic table which react with metals to form salts.
  • halides: are the name of salts formed from halogens, e.g sodium chloride (NaCl).
  • diatomic: element consists of two atoms of the same type, chemically bonded together.

Common Mistakes To Avoid

  • Pupils often forget that the halogens are diatomic molecules.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

Group 7 elements are very reactive and their reactivity decreases down the group. Moving down Group 7 elements, atomic mass, density, and melting and boiling points increase.

2. Define this scientific word and use it in context. 'salts'

are ionic compounds formed from positive and negative ions electrostatically attracted to each other. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Pupils often forget that the halogens are diatomic molecules. Correction: Explanation of the bonding to form molecules helps to explain why they exist as diatomic molecules.

More Lessons In This Unit

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