Homonuclear diatomic molecule molecular orbital diagram

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. 

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. 

As can be seen from its ground-state molecular orbital diagram in Figure 4.11, dioxygen has a paramagnetic ground state. It is the only stable homonuclear diatomic molecule with this property. 

Figure 4.2 The molecular orbital diagrams for homonuclear diatomic molecules of the second short period, Li. to Ne2. Diagram (a) is appropriate for 02, F2 and Ne2, diagram (b) for the molecules Li2 to N2...

The molecular orbital diagram for the nitrogen monoxide molecule is shown in Figure 4.6. The orbitals are produced from the same pairs of atomic orbitals as in the cases of the homonuclear diatomic molecules of Section 4.2. 

Figure 2-12 Energy diagrams for a homonuclear diatomic molecule. Note that the differences in the energy levels of the atoms are larger than the energy differences between the molecular orbitals. Diagram (a) is appropriate for no interaction between 2s and 2p levels, and diagram (b) is appropriate for substantial interaction between 2s and 2p levels. Refer to pp. 36-38.

Homonuclear diatomic ions can be treated in a manner similar to that used for neutral molecules. Although the relative energies of molecular orbitals in such ions may be somewhat different than in the neutral molecules, in general the molecular orbital diagram for the molecules may be used for the ions simply by adjusting the electron count. For example, the molecular orbitals of the ions 02+, 02, and 022- may be described using the orbitals for neutral 02 in Figure 2-4. 

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... 

Figure 9-5 Energy level diagrams for first- and second-period homonuclear diatomic molecules and ions (not drawn to scale). The sohd lines represent the relative energies of the indicated atomic and molecular orbitals, (a) The diagram for H2, Hc2, Li2, Bc2, B2, C2, and N2 molecules and their ions, (b) The diagram for O2, F2 and Nc2 molecules and their...

Your molecular orbital diagram should look like figure 2.18 which shows the MO diagram for Period 2 homonuclear diatomic molecules from Li2 to N2. Each carbon atom has four valence electrons, thus a total of 8 electrons has to be placed in the molecular orbitals on the diagram. Keep in mind that you still follow the Hund s rule and the Pauling exclusion principle when filling molecular orbitals with electrons. See the solution for E2.22... 

Partial orbital energy-level diagram of NO. The molecular orbitals are labelled in the two ways that we introduced for homonuclear diatomic molecules. Note that we reach higher numbers when labelling the a and it orbitals than we did for N2 or 02. This is because we can no longer distinguish g and u, and so have to label all a and all it orbitals consecutively. 

Figure 11.20 MO occupancy and molecular properties for B2 through Ne2- The sequence of MOs and their electron populations are shown for the homonuclear diatomic molecules in the p block of Period 2 [Groups 3A(13) to 8A(18)]. The bond energy, bond length, bond order, magnetic properties, and outer (valence) electron configuration appear below the orbital diagrams. Note the correlation between bond order and bond energy, both of which are inversely related to bond length.

Fig. 3-13. The energy level diagram obtained in a molecular orbital treatment of a homonuclear diatomic molecule in which only j and p orbitals are used and sa-pa...

MOLECULAR ORBITAL DIAGRAM OF CERTAIN HOMONUCLEAR DIATOMIC MOLECULES... 

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