survey of the elements : 1. element structures 2. oxide structures 3. cool things about some...
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Survey of the Elements : 1. Element structures 2. Oxide structures 3. Cool things about some elements. Structures of the Elements. Metals: Close packing. Number of Bonds Possible:. Allotropes of Boron: linked B 12 icosahedra. β- R boron. α- R boron. γ- boron. - PowerPoint PPT PresentationTRANSCRIPT
Survey of the Elements:
1. Element structures2. Oxide structures3. Cool things about some elements
Structures of the Elements
Metals: Close packing
Number of Bonds Possible:
α-R boron
β-R boron
γ-boron
Allotropes of Boron: linked B12 icosahedra
Traditional Allotropes of Carbon
New Allotropes of Carbon: Fullerenes
C60
New Allotropes of Carbon: Nanotubes
New Allotropes of Carbon: Graphene
Industrial Production of Diamonds
Why is diamond formed, and not graphite?
Reason 1. Reverse Reaction favors Graphite InstabilityH + diamond CH4, but slower than CVD diamond growthH + graphite CH4, but faster than CVD graphite growth
Reason 2. Forward Reaction favors Diamond Formationsp3 C atoms on surface (show structures) slow sp2 graphite formation.
H2(g) 2 H(g)H(g) + CH4(g) CH3(g) + H2(g)CH3 + C(diamond-H, surface) Diamond-CH3 + H