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.
You don't say that. What you do say is that the valency of sulphur in sulphur trioxide is 6.
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.
Tungsten metal doesn't have any charge. In its compounds, tungsten can have different oxidation states / charges. The most common formal oxidation state of tungsten is +6, but it exhibits all oxidation states from −2 to +6.
The valency of lithium is 1. It has one valence electron in its outer shell.
Xenon Trioxide
Its standard name is, Nitrogen(III) Oxide.
Its valency is 0.
the valency is 4
Dinitrogen Trioxide: N2O3
radon trioxide
Sulfur trioxide is a byproduct of sulfuric acid. In large quantities, sulfur trioxide can be deadly. For the most part, small quantities of sulfur trioxide will not hurt you.
the valency for nitrite is 5