Which non-metals have Valency 3?

If the question is restricted to main group elements, elements with three or five valence electrons are to be considered, these being boron as well as nitrogen, phosphorus, arsenic and antimony. read more

The element is electropositive and thus a metal, which means there is no non-metal with 3 valance electrons. Note: Metals can have 1, 2 or 3 valance electrons in its outermost shell. Non-metals can have 5, 6, 7 or eight valance electrons (most cases). read more

Non-metals have 5,6 or 7 electrons in their valence shell therefore they can easily accept electrons to get the octet configuration. Therefore the valency of non-metals can be 1, 2 and 3 with negative sign. For example the valency halogen is -1 while valency of oxygen, sulphur (S 2-), sulphate (SO 4 2-) and carbonate is 2-. On the other hand nitride and phosphate (PO 4 3-) is 3-. read more