Question

why can't sulphur has covalency 3 ?​

Answer 1

The atomic number of sulphur is 16. Hence it has 2 electrons in its first shell, 8 electrons in its second shell. So the balance number of electrons which can come in its third shell is 6. Hence the valency of sulphur is 6.

Answer 2

Answer:Because sulfur has three energy levels, however, it theoretically has a 3d sublevel (although the 3d sublevel is unpopulated in the ground state). Sulfur can hybridize its valence orbitals into a sp3d2 configuration, which permits it to have six bonding orbitals with terminal atoms.

Explanation:hope it helped u