Copper has an atomic number of 29. that means that there are 29 protons in the nucleus of each copper atom. that's what the atomic number is; the number of protons in an atom of each certain element. if one copper atom contains 29 protons, how many electrons are in 4 atoms of copper?

There are 116 electrons in four atoms of copper.

In a neutral atom, there is one electron for each proton.

No. of protons = 4 atoms Cu × (29 protons/1 atom Cu) = 116 protons

No. of electrons = 116 protons × (1 electron/1 protons) = 116 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.