Why does sulphur stop at 6 bonds? Why can't it form 9 bonds because even after forming 6 bonds,it has empty d orbitals? And even if we consider steric factors, then why in the structure of sulphate ion, negative charge is on oxygen? Why not on sulphur with sulphur with sulphur forming double bond...

This paper[1] uses chemical manganese dioxide (CMD) instead of activated manganese dioxide for mild alcohol oxidationI'm looking for a route on how to synthesize active CMD. Could this work? Mn2O7 + 3 MnO → 5 MnO2 2 KMnO4 + 3 MnSO4 + 2 H2O→ 5 MnO2 + K2SO4 + 2 H2SO4 How to make chemically pure MnO...

I understand (for example in the case of H2) that two s orbitals produce through constructive interference a bonding orbital and that the out of phase combination of two s orbitals leads to destructive interference, followed by the apparition of an antibonding orbital, but, as far as I know, thes...