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2.2.3 Electronic configuration and position in the periodic table
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Filling electron shells

Filling electron shells

Electrons occupy fixed energy levels called shells around the nucleus. For the first 202020 elements, the first shell holds up to 222 electrons, while the second and third shells hold up to 888 electrons each.

2.2.3 Electronic configuration and position in the periodic table Lesson

  1. GCSE
  2. /Chemistry
  3. /2.2.3 Electronic configuration and position in the periodic table

Step-by-step lessons on Edexcel GCSE Chemistry 2.2.3 Electronic configuration and position 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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