S = +6 valency
O = -2 valency
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The valency of trioxide is 6. This is because oxygen typically has a valency of 2, and the prefix "tri" indicates there are three oxygen atoms present in the molecule, resulting in a total valency of 6 for the trioxide molecule (O3).
Carbon Monoxide is a compound and as such does not have valence electrons. It will Complex transition metals such as nickel though.
Things are complicated if we use the term valency. It is better to use the term Oxidation state or Oxidation Number. In SO2, the oxidation state of sulphur is +4 and In SO3, the oxidation state of sulphur is +6.
Xenon Trioxide
radon trioxide
The valency of sulfur is typically 2, 4, or 6, depending on the compound it forms.
The name of the compound Cl2O3 is dichlorine trioxide.