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explain in terms of bonding how the presence of o2 an ozone in the ozone layer...

explain in terms of bonding how the presence of o2 an ozone in the ozone layer helps to prevent both higher and lower energy uv light from reaching the surface of the earth

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Dioxygen (O2) molecule has bond-order of 2 while, ozone (O3) has bond order of 1.5 ....Thus, O2 molecule is more stable than O3 molecule.

Long-wave (lower energy) UV light has enough energy to break O3 molecule to produce an O2 molecule and a O free radical....but, unable to break more stable dioxygen molecule.While, short-wave (higher energy) UV light breaks the dioxygen molecule (O2) into the two O free-radicals. Each oxygen free radical, further, combines with another O2 molecule to form an ozone molecule.

Hence, O2 molecules protect earth from higher energy UV-light (short-wave UV) by absorbing it.,while O3 molecules protect earth from lower energy UV-light (long-wave UV light) by absorbing it....Neither alone would protects earth from the UV-light effectively.........

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