The modern periodic table has groups. (write your answer as a number.)

18 groups

Explanation: First of all group means that we consider from top to bottom or column in a periodic table.

As we know that periodic table is divided into s,p,d and f blocks.

S -block has 2 groups and P- block has 6 groups and d- block had 10 groups. So total 18 groups.

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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.