Electron affinity graph

Comparison of the ionization and electron affinity graphs in Figure 2.13 shows similar zigzag patterns, but with the two graphs displaced by one element for example, electron affinity shows a peak at F and valley at Ne, and ionization energy a peak at Ne and valley at... 

Figure 2.16 Graph of the electron affinities (ea) of the first 30 elements (as y) against atomic number (as x)...

For further discussion of electron affinities, together with useful charts and graphs, see Chen, E C. M.. Wentworth, w. E. J. Chem. Educ. 1975,52,486. 

Figure 4.12 ECD data plotted as In A"/ 3/2 versus I,

The TEA to three acetate derivatives have been investigated acetic anhydride, benzyl acetate, ethyl acetate (30). In all cases a negative slope in a In KT3/2 vs. 1/T graph was observed at higher temperatures which we associate with a dissociative step. For the three molecules included in the study, dissociative TEA leading to the acetate negative ion would be the most favored thermodynamically. The acetate radical is reported to have an electron affinity of 3.3 e.v. (20), which should far exceed the electron affinity of other possible radicals. 

Other theoretical tests of aromaticity have been studied. The graph theory has predicted thiepine to be antiaromatic <76JA2750>. A new measure of aromaticity has been studied on the basis of absolute hardness >]) known to be an index of stability and reactivity of a molecule. The operation formula is the equation, tj = (/-/l)/2 where / is the ionization potential and A the electron affinity. Alternatively, the equation is rj = (Fhomo- lumo)/2. Absolute hardness has also predicted thiepine (1) and 2-benzothiepine (5) to be antiaromatic and 3-benzothiepine (6) to be nonaromatic. However, the prediction by this approach fails for 1-benzothiepine (2) <89JA737l>. 

Which property of the group 6A elements might be the one depicted in the graph shown here (a) electronegativity, (b) first ionization energy, (c) density, (d) X—X single-bond enthalpy, (e) electron affinity Explain your answer. [Sections 22.5 and 22.6]... 

Figure 6.22 I The graph shows the electron affinity (in kj/moi) vs. atomic number for the first 20 elements of the periodic table. The inset at the upper right emphasizes the general periodic trend Electron affinity increases —meaning that the value becomes more negative—from left to right and bottom to top in the periodic table.

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