Hexagonal geometry

Ice (H20) is a molecular crystalline solid. Six water molecules bond to each other to form a hexagonal pattern. This pattern is reflected in the hexagonal geometry exhibited in snowflakes. In Activity 4.1, you will construct models of basic crystalline solids and grow molecular-solid crystals. Then you will consider the basic structures of crystalline solids and look upon these structures as three-dimensional works of art. 

Most recent studies have concluded that the regular hexagonal geometry of benzene results from the o bonds rather than the n bonds. This is reasonable since the a C-C bonds are stronger than the n bonds by about 20 kcal/mol. One would expect the a bonds at each carbon would have the same hybridization if at all possible, and thus in the absence of any other overriding factor, benzene should adopt its observed geometry in order to minimize its a energy. 

To verify that the sensitivity of hexagonal geometry telescopes is related to... 

Fig. 4. The sensitivity dependence (on the sampling ratio) of the correlation map for hexagonal geometries...

Hexagonal geometry power distribution has been calculated for FBTR core to estimate precisely heat generation rates. The variation of power coefficient and bumup reactivity loss rate as a function of bumup in FBTR has been measured. 

Because of the similarities in bonding, pyridine resembles benzene in shape. It is planar, with nearly perfect hexagonal geometry. It is aromatic and tends to undergo substitution rather than addition reactions. 

Figure XXII-7 shows the SSTAR core map. The fuel lattice consists of cylindrical fuel rods arranged on a triangular pitch (the hexagonal geometry does not imply that the core is formed of individual hexagonal fuel assemblies or bundles it merely reflects the assumed nodalization used for neutronics modelling.) A central two low enrichment zones blanket, the three enrichment zones, and locations for shutdown and control rods are indicated in the figure.

On branch EF a rhombic transition again occurs, with each layer attaining hexagonal geometry. 

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