The maximum covalency of S is
6
4
2
1
Oxygen has a maximum covalency of two while other elements can show a maximum covalency of six
These elements have vacant d orbitals while oxygen has not.
The maximum valency of an atom is equal to the no. of atom is equal to the no. of electrons present in the valence shell of that atom.
Hence S has maximum covalency of 6.
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