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States of Matter - PhET Interactive Simulations
States of Matter: Basics - Atoms - PhET Interactive Simulations
Chem4Kids.com: Matter: Solids
12.2: The Arrangement of Atoms in Crystalline Solids
States of Matter: Basics - States of Matter | Atoms - PhET
States of Matter - Science Notes and Projects
States of matter: A simple introduction to solids, liquids, gases
10.5 The Solid State of Matter - Chemistry 2e - OpenStax
11.7: Structure of Solids - Chemistry LibreTexts
10.5: Solids - Chemistry LibreTexts