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Solids

Solids. Solids retain their shapes because they have rigid crystal structures. Based on the attractive forces that hold tem together or on the arrangement of the atoms in the crystals themselves. Solids. Crystal Types Based on Attractive Forces Metallic crystals Ionic crystals

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Solids

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  1. Solids • Solids retain their shapes because they have rigid crystal structures. • Based on the attractive forces that hold tem together or on the arrangement of the atoms in the crystals themselves.

  2. Solids • Crystal Types Based on Attractive Forces • Metallic crystals • Ionic crystals • Molecular crystals • Network (covalent) crystals • Amorphous (noncrystalline) substances

  3. Bi Solids • Metallic Crystals • All metals in the periodic table are solids at 25°C, except mercury. • A rigid structure of metal nuclei and inner electrons, valence electrons are very mobile, moving freely from atom to atom. • Mobile e- bond atoms together with widely varying degrees of force • Fe, Cr, Co, Au, Pt, & Cu have MP above 1000°C. • Hg & Ga melt at or below room temperature

  4. Malleable Solids Ductile • Metallic crystals • Mobile valence e- explain the ability of metals to conduct heat & electricity • Interaction of light with mobile valence e- is responsible for a metal’s luster • Some metals (Pb, Au, Na, & K) are soft & can be cut with a knife • Others (Sn & Zn) are brittle • Most metals are malleable & ductile • These properties are due to crystal structure- allow movement of atoms without a major disruption in the crystals

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