Which statement describes a concept included in the wave-mechanical model of the atom? 1. Positrons are located in shells outside the nucleus. 2. Neutrons are located in shells outside the nucleus. 3. Protons are located in orbitals outside the nucleus. 4. Electrons are located in orbitals outside the nucleus?

im not exactly sure but i think its b!

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.