Bond energy defined

Values for single-bond energies, defined in this way, for many bonds can be found by this process—for the S—S bond from the Sg molecule (an eight-membered ring containing eight S—S bonds), for N—H, P—H, S—H, and so forth from NH, PHS, H S, and so forth. These values are given m Table 3-4. 

When an impacting particle transfers energy to a near sinface carbon atom in an amount sufficient to overcome the lattice bond energy or surface binding energy, some carbon atoms may be displaced and move in a direction defined by the angle... 

On the other hand, the bond density surface is able to provide quantitative information The three surfaces shown below correspond, respectively, to the reactant, the transitioi state (a transition state is a molecule that is on the way to becoming the products an< its energy defines how fast the reaction can proceed), and the two products. 

These questions can be answered on a molecular level in terms of a quantity known as bond enthalpy. (More commonly but less properly it is called bond energy.) The bond enthalpy is defined as AH when one mole of bonds is broken in the gaseous state. From the... 

The method has been confined to main-group compounds presumably because of irregularities expected with unsymmetrical charge distributions in transition metal ions. The noble gas compounds remain outside the scope of the method because of the way in which electronegativity is defined (atom compactness relative to interpolated noble atom compactness). The main weakness of the method when applied to fluorides is in the somewhat arbitrary choice of fluorine bond energies. 

Ideally the hydrogen-bond energy is defined with respect to isolated species (1) but obtaining this information directly has been possible for only a few gaseous systems. 

The hydrogen-bond energy, (OHO), of the cyclic enol is generally defined relative to the open form of the enol (16). 

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