Luke's elective three "Understanding Crystals" ppt crystals have a regular geometric shape derived from the particles that make up the crystals are periodically arranged according to a certain rule. So how are the particles in the crystal arranged? How to understand the regularity of the arrangement of particles inside the crystal? In the structure of metal crystals, ionic crystals, and molecular crystals, metal bonds, ionic bonds, and intermolecular forces have no directionality, and they tend to attract atoms, ions, or molecules to attract as many particles as possible to be distributed around, and densely packed Way to reduce the energy of the system and make the crystal more stable
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