SSC MTS EXAM

Detailed explanation-1: -Sulfur shows valencies of two, four, and six due to the presence of the empty d-orbital. It has a valency of as it only requires two more electrons to complete its octet.

Detailed explanation-2: -Oxygen is divalent, but sulphur exhibits variable valency of 2, 4 and 6 since the atomic radius of sulphur is larger than that of oxygen, because of the presence of d-orbitals.

Detailed explanation-3: -The sulphur atom has 6 electrons in the outermost shell, and its valency could be 6. But it is easier for sulphur to gain two electrons instead of losing six electrons. Hence, its valency is determined by subtracting six electrons from the octet and this gives a valency of two for sulphur.