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Inside an atom

Inside an atom

Scale comparison showing an atom of radius approximately 1 \times 10^{-10} \, \text{m}, its central nucleus of radius approximately 1 \times 10^{-14} \, \text{m}, electrons in shells, and a magnified nucleus containing protons and neutrons

An atom has a radius of about 0.1 nm0.1 \, \text{nm}0.1nm, which is 1×10−10 m1 \times 10^{-10} \, \text{m}1×10−10m. Its nucleus is the tiny central region containing protons and neutrons.

1.1.5 Size and mass of atoms Lesson

  1. GCSE
  2. /Chemistry
  3. /1.1.5 Size and mass of atoms

Step-by-step lessons covering AQA GCSE Chemistry 1.1.5 Size and mass of atoms for Foundation and Higher tier. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.

Lessons