Question: how many valence shell and unpaired electrons are present in one sulfur atom?
Answer: Sulphur has atomic number 16. The electronic configuration of sulphur atom in its ground state is [1s2, 2s2,2p6]]3s2 3p4. Thus it has 2 unpaired electrons ,its normal valency is 2, It might engage 4/6 electrons by promoting 1/2 electrons to energetically accessible & vacant 3d orbitals & can exhibit valence 4 &6 also.