Crystal Definition, Examples, and Common Types - ThoughtCo
https://www.thoughtco.com/what-is-a-crystal-607656
WEBSep 13, 2019 · A good example is a sugar crystal, which contains sucrose molecules. Metallic Crystals: Metals often form metallic crystals, where some of the valence electrons are free to move throughout the lattice. Iron, for example, can form different metallic crystals. Ionic Crystals: Electrostatic forces form ionic bonds.
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