Ozone, O3(g), is produced from oxygen, O2(g), by electrical discharge during thunderstorms. The unbalanced equation below represents the reaction that forms ozone. Both oxygen's in O2 has achieved an octet (Noble gas configuration) while an oxygen atom has 6 valence electrons.

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c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.