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9). 907 Hexagonal Close-Packed Examples are: Zn, Cd, Se, Ti, Sc, CO,Ru, OS, Zr, Hf. 10. 10, the three central atoms plus the one at the center of the top show this to be an equilateral tetrahedron with edges, a = 2r . From geometric considerations, h = a,/$. 866a 0 . 1 BONDSANDBONDTYPES Metals and Metallic Bonding Metallic elements are good conductors of heat and electricity, in contrast to non-metallic elements, and they are opaque, lustrous, and can be deformed or shaped. These properties can be accounted for on the basis of the non-directionality of their bonding and their tendency to solidify in as closely a packed 15 arrangement as possible.

For directional bonding, the local atomic arrangement is determined by the bond angles. For non-directional bonding, the packing arrangement depends on the relative sizes of the atoms. The long-range structure of a solid then depends upon repetition of the polyhedra formed by the bond angles (directional) or atom packing (non-directional). Covalent and permanent dipole bonds are directional while metallic, ionic, and van der Waals bonds are non-directional. Before we consider the major classification of bond types, we first address the question of how many ways can points in space be arranged in three dimensions so that each point has identical surroundings.

Random arrangement of the substituents along the polymer chain gives the atactic isomer. When all the substituents are on one side of the plane, the resulting structure is the isotactic isomer form while regular alternation of substituents produce the syndiotactic form. The Polymer Structures (a) Idealized CH, Chain, Distances in (b) A Random CH, Polymer Chain Figure 1. 17. If two different substituents are present on a carbon atom of the polymer chain, the carbon is asymmetric since the two parts of the chain with which it is connected are also different.

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