Q3 of 38 Page 3

What is the valency of
a. Sulphur in SO2 
b. phosphorous in P2O5

a. The valency of Sulphur in SO2 is 2.
b. The valency of phosphorous in P2O5 is 5.

More from this chapter

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1 What are the postulates of Dalton's Atomic theory? 2 Write the chemical formulae of the following compounds:
a. Magnesium sulphide
b. Ferric chloride 4 Write the significance of chemical formula.
  5 Explain the rules for writing a chemical equation.