For 10 points, name this positive particle found in the nucleus.
Removal of one of these objects from a carbonyl creates an enolate. Their magnetic resonance is used in the form of NMR that has typical chemical shifts of zero to twelve. One of them is transformed in electron capture. While they do not exist freely in solution, they can combine with water to form a (*) hydronium ("high"-DRO-nee-um) ion. The Bronsted-Lowry definition describes acids as donators of these particles. For 10 points, name this positive particle found in the nucleus.
Removal of one of these objects from a carbonyl creates an enolate.
{proton} [or {H+}; or {hydrogen} nucleus; prompt on {hydrogen}]