KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY
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 consti- tuent of water, minerals, and organic matter. It can be isolated by electrolysis of water. Hydrogen combines with industrially in hydrogenation of fats and oils, and in methanol synthesis etc.
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