Imagine the following scenario involving marbles as "radioactive isotopes". Let's say the half-life of green marbles is 1 million years.

In one hand, you're holding 2 green marbles. In your other hand, you're holding 500,000 green marbles.

Hypothetically, noting that we have two different starting amounts of "isotopes", how long will it take for half of each amount to decay?

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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.