Computer graphic of an atom of Hydrogen. The nucleus of Hydrogen contains one proton (red) and no neutrons. An electron cloud (blue) surrounds the nucleus, which in Hydrogen contains a single orbiting electron. The electrically positive proton balances the single electrically negative electron to make the atom neutral overall. Hydrogen is the lightest element, and occurs free in some natural gases and is a widespread constituent- of water, minerals, and organic matter. It can be isolated by electrolysis of water. Hydrogen combines with most elements to give hydrides; it is used industrially in hydrogenation of fats and oils, and in methanol synthesis etc.