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Chem_215_Lect_35_Color

Chem_215_Lect_35_Color - (abab Hexagonal Closest Packing...

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1 (abab) “Hexagonal Closest Packing”
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2 (abcabc) “Cubic Closest Packing” Face Centered Cubic Unit Cell
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3 Face centered cubic (abc) 4 2 1 x 6 8 1 x 8 cell unit in spheres of # = + =
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4 Nickel: Face centered cubic(abc) 45. Nickel has a face centered cubic unit cell. The density of nickel is 6.84 g/cm 3 . What is the atomic radius of nickel?
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5 Body-Centered Cubic (not closest packed) Center sphere deleted for clarity 2 1 8 1 x 8 cell unit in spheres of # = + =
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6
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7
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8 Metals Alkali Metals Alkaline Earth Metals
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9 Atoms Bands in Crystal (Mg) Electronic Structure: Isolated Atoms vs. Solids
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10
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11 MO Energies in two different materials: Diamond (Insulator) Metal (Conductor)
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12 Semiconductors Si (Group 4A) doped with As (Group 5A) Si (Group 4A) doped with B (Group 3A) Conductivity increased due to presence of extra electrons (negative; n) which can be easily excited Into the conduction band.
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