A compound consisting of only chlorine and this element converts carboxylic acids to acyl chlorides.This element's pentoxide 
A compound consisting of only chlorine and this element converts carboxylic acids to acyl chlorides.This element's pentoxide actually consists of ten atoms of oxygen and four atoms of this element. In aphenomenon named for this element but ironically not actually demonstrated by it, an electron decays to atriplet intermediate state before returning to the ground state. The strong double bond this element formswith oxygen drives the Wittig reaction. In its most common form, this element exists as a tetrahedralstructure which decomposes into a pentagonal structure, its "red" form, when heated. The white allotrope ofthis element is most common. For 10 points, name this element located directly below nitrogen on thePeriodic Table.
A compound consisting of only chlorine and this element converts carboxylic acids to acyl chlorides.
phosphorus [or P]