pBlock ElementsII 1 Question 103
100. Give reason for “valency of oxygen is generally two, whereas sulphur shows valency of two, four and six.”
$(1988,1 \mathrm{M})$
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Solution:
- Oxygen lacks empty $d$-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 $3 d$-orbitals in its valence shell, can violate octet rule, show di, tetra and hexa valency.
