The HOMO is the 2p orbital, which can interact with the 1s of the H+, as in the diagram at right. The bond order is three, with no unpaired electrons. By itself, O 2 is not magnetic, but it is attracted to magnetic fields. The CN energy level diagram is similar to that of NO (Problem 5.7) without the antibonding electron. However, this picture is at odds with the magnetic behavior of oxygen. The energy of such an absorbed photon is enough to raise one electron to the antibonding MO, producing an excited state whose electron configuration is (σ 1 s) 1(σ 1 s *) 1. There is an OO double bond, and each oxygen atom has eight electrons around it. If a sample of H 2 is irradiated with ultraviolet light, however, an absorption band is observed between 110 and 170 nm. This diagram suggests that the energy of an H 2 molecule is lower than that of a. The two electrons associated with a pair of hydrogen atoms are placed in the lowest energy, or bonding, molecular orbital, as shown in the figure below. This molecular electron configuration is written (σ 1 s) 2, and it corresponds to a covalent electron-pair bond holding the two H atoms together. Electrons are added to molecular orbitals, one at a time, starting with the lowest energy molecular orbital. Thus the lowest energy arrangement for H 2 would place both electrons in the a 1 s MO with paired spins. Like an atomic orbital, each molecular orbital can accommodate two electrons. The Greek letter σ in the labels for these orbitals refers to the fact that their positive or negative overlap occurs directly between the two atomic nuclei. Pictorial Molecular Orbital Theory is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts. Because all of the electrons are paired, F 2 is diamagnetic. 1/2(10 - 8) 1 B.O is one so the fluorine molecule is stable. How do you populate the electrons Answer Count the valence electrons on the molecule. The molecular orbital diagram for the diatomic fluorine molecule, F 2 is. (In general, antibonding MO’s are distinguished from bonding MO’s by adding an * to the label.) The energies of the molecular orbitals are indicated by the horizontal lines in the center of the diagram. A Molecular Orbital Diagram for a diatomic molecule (two atoms) varies in the number of electrons. For chem videos, quizzes and more download Chemistry X for free on the App Store Correlation Diagrams - by considering the positions and energies of electr. Above it is a dot-density diagram for a single electron occupying the antibonding MO, σ 1 s *. A dot-density diagram for a single electron occupying the bonding MO formed by positive overlap of the two orbitals is shown in the center of the diagram. The horizontal lines show the energy each of these electrons would have. Electron dot-density diagrams for the 1 s electron in each of two separate H atoms are shown on the left and right sides of the figure.
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