Phosphorus has valencies of 3 and 5.
What is the formula of the two oxides of phosphorus?

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Solution

The two common oxides of phosphorus are $P_{4} O_{6}$ (phosphorus trioxide/tetraphosphorus hexoxide), in which phosphorus has valency 3, and $P_{4} O_{10}$ (phosphorus pentoxide/tetraphosphorus decaoxide), in which phosphorus has valency 5.

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