Molecular Oxygen O2,Dioxygen Octet on each atom Stable 0-0 r=1.208A BDE 117.1 kcal/mol 21%of atmosphere Ozone Ozone,03 Non-octet .0-0-c r=1.278A 4 times weaker bond a=116.8deg Reactive and caustic BDE 24.0 kcal/mol VII-7O2 , Dioxygen Octet on each atom Stable Ozone, O3 Non-octet O=O O-O=O 21% of atmosphere 4 times weaker bond Reactive and caustic . . • • • • • • • • • • • • • • • • • • VII-7