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1.2.5 Group 1
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Group 1 and the outer electron

Group 1 and the outer electron

Group 1 contains the alkali metals, including lithium, sodium and potassium. Every Group 1 atom has one electron in its outer shell. Their electron-shell configurations are lithium (2,1)(2,1)(2,1), sodium (2,8,1)(2,8,1)(2,8,1) and potassium (2,8,8,1)(2,8,8,1)(2,8,8,1). These atoms have 1, 2 and 3 inner shells respectively.

1.2.5 Group 1 Lesson

  1. GCSE
  2. /Chemistry
  3. /1.2.5 Group 1

Step-by-step lessons on AQA GCSE Chemistry 1.2.5 Group 1. 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.

Lessons