CHEM-1601 Chapter Notes - Chapter 12: Cubic Crystal System, Coordination Number, Ice
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How is the lattice represented with the unit cell: crystalline lattice: the regular arrangement of atoms within a crystalline solid i. Coordination number: 6: coordination number: the number of atoms with which each atom is in direct contact, aka the number of atoms with which a particular atom can strongly interact iii. iv. Packing ef ciency: 52: packing ef ciency: the percent of the volume of the unit cell occupied by the spheres, the higher the coordination number, the higher the packing ef ciency v. vi. vii. Consists of a cube w/ 1 atom at each corner. The atoms touch along edge of the cube, so the edge length is twice the radius of the atoms (l = 2r) There is atom at each of the 8 corners of the unit cell, for a total of 1 atom/unit cell: body-centered cubic i. ii. Coordination number: 8 iii. iv. v. vi. vii. Edge length in terms of r: 4r/sq rt 3.