Diatomic molecules molecular orbital energy level

Figure 7.14 Molecular orbital energy level diagram for first-row homonuclear diatomic molecules. The 2p, 2py, 2p atomic orbitals are degenerate in an atom and have been separated for convenience. (In O2 and F2 the order of

FIGURE 3.31 Atypical molecular orbital energy-level diagram for the homonuclear diatomic molecules Li2 through N2. Each box represents one molecular orbital and can accommodate up to two electrons. 

FIGURE 3.33 A typical d molecular orbital energy-level diagram for a heteronuclear diatomic molecule AB the relative contributions of the atomic orbitals to the molecular orbitals are represented by the relative sizes of the spheres and the horizontal position of the boxes. In this case, A is the more electronegative of the two elements. 

The molecular orbital energy-level diagrams of heteronuclear diatomic molecules are much harder to predict qualitatitvely and we have to calculate each one explicitly because the atomic orbitals contribute differently to each one. Figure 3.35 shows the calculated scheme typically found for CO and NO. We can use this diagram to state the electron configuration by using the same procedure as for homonuclear diatomic molecules. 

Fig. 3.14 The occupancy of the molecular orbital energy levels across the first row diatomic molecules. (After Cotton and Wilkinson (1980).)...

Fig. 5.12 Simplified molecular orbital energy levels for diatomic molecules of elements in the second period, assuming no mixing of s and p orbitals. The three 2p orbitals are degenerate, that is, they all have the same energy and might also be...

Fig Molecular orbital energy level diagram for diatomic homonuclear molecules such as 02, F2, etc. 

Molecular Orbitals of H2. The simplest example of a diatomic molecule is H2. For this molecule, the only atomic orbitals available are the Is orbitals of the hydrogens. These orbitals interact to yield bonding als and antibonding als molecular orbitals the molecular orbital energy level diagram is shown in Figure 2-3. (Subscripts are often used to designate the atomic orbitals from which the molecular orbitals are derived.)... 

Prepare a molecular orbital energy level diagram for nitric oxide (NO) and predict the bond order of this molecule. On the basis of the molecular orbital diagram, what do you predict for the bond orders of NO+ and NO Which of these diatomic species would you expect to have the shortest bond length Why ... 

Figure 9-5 shows molecular orbital energy level diagrams for homonuclear diatomic molecules of elements in the first and second periods. Each diagram is an extension of the... 

The following is a molecular orbital energy level diagram for a heteronuclear diatomic molecule, XY, in which both X and Y are from Period 2 and Y is slightly more electronegative. This diagram may be used in answering questions in this section. 

Draw a molecular orbital energy level diagram for each of the following species He2, HHe, HeJ. Compare their relative stabilities in terms of bond orders. (Treat HHe as a diatomic molecule with three electrons.)... 

Molecular orbital energy-level diagrams similar to those for diatomic molecules can be constructed for polyatomic molecules. 

Draw simple molecular orbital energy-level diagrams for diatomic molecules and simple polyatomic molecules. (Questions 4.1, 4.2, 4.4,4.5, 4.7-4.9 and 5.4)... 

The molecular orbital energy-level diagram represented in Fig. 9.35 predicts that the B2 molecule will be diamagnetic, since the MOs contain only paired electrons. Flowever, experiments show that B2 is actually paramagnetic with two unpaired electrons. Why does the model yield the wrong prediction This is yet another illustration of how models are developed and used. In general, we try to use the simplest possible model that accounts for all the important observations. In this case, although the simplest model successfully describes the diatomic molecules up to B2, it certainly is suspect if it cannot describe the B2 molecule correctly. This means we must either discard the model or find a way to modify it. 

Be able to draw molecular orbital energy-level diagrams and place elections into them to obtain the bond orders and electron configurations of diatomic molecules using molecular orbital theory. (Sections 9.7 and 9.8)... 

Hgure 8.13 The molecular orbital energy levels of the second-row homonudear diatomic molecules, and their electron... 

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