Q. Give reason for
''valency of oxygen is generally two, whereas sulphur shows valency of two, four and six.''

 1520  186 IIT JEEIIT JEE 1988The p-Block Elements - Part2 Report Error

Solution:

Oxygen lacks empty -orbitals in its valence shell, cannot violate octet rule, hence in most of its compound it show only divalency. On the other hand, sulphur has vacant -orbitals in its valence shell, can violate octet rule, show di, tetra and hexa valency.