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7.1.1 Classifying elements by group in the periodic table
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Groups and outer-shell electrons

Groups and outer-shell electrons

Simplified periodic table showing Groups 1, 7 and 0, with electron-shell examples for sodium, chlorine and argon

A group is a vertical column in the periodic table. Elements in the same main group have the same number of electrons in their outer shell, so they often have similar chemical properties.

7.1.1 Classifying elements by group in the periodic table Lesson

  1. GCSE
  2. /Chemistry
  3. /7.1.1 Classifying elements by group in the periodic table

Step-by-step lessons on Edexcel GCSE Chemistry 7.1.1 Classifying elements by group in the periodic table. Each one builds up to exam-style questions. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.

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