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1.Give the MO designations for O2, O21-, O22-, O21+, and O22+. (b) Give the bond order in each case. (c) Match these species with the following observed bond lengths: 1.04 Å; 1.12 Å; 1.21 Å; 1.33 Å; and 1.49 Å.

2.Use Lewis formulas to depict the resonance structures of the following species from the valence bond point of view, and then sketch MOs for the delocalized systems. (a) NO31-, nitrate ion; (b) HCO31-, hydrogen carbonate ion (H is bonded to O); (c) NO21-, nitrite ion. Note: The valence bond point of view refers to the resonance structures while the MOs refer to the resonance hybrid.

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