Lesson 3.2: Atomic Structure Summary

Key Concepts: Atomic Structure

Core Definitions

  • Nucleus: The dense, central core of an atom containing protons and neutrons.
  • Electron Cloud: The region around the nucleus where electrons are most likely to be found.
  • Energy Levels: Regions around the nucleus where electrons orbit; numbered 1, 2, 3, etc.
  • Atomic Radius: The size of an atom measured from the nucleus to the outer electron cloud.
  • Nuclear Force: The strong force that holds protons and neutrons together in the nucleus.
  • Atom: The smallest unit of an element that retains the element's chemical properties.
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