a hydrogen atom is first formed
111sodium — /soh dee euhm/, n. 1. Chem. a soft, silver white, metallic element that oxidizes rapidly in moist air, occurring in nature only in the combined state, and used in the synthesis of sodium peroxide, sodium cyanide, and tetraethyllead: a necessary… …
112ionosphere and magnetosphere — ▪ atmospheric science Introduction regions of Earth s (Earth) atmosphere in which the number of electrically charged particles ions (ion) and electrons (electron) are large enough to affect the propagation of radio waves (electromagnetic… …
113Aromatic hydrocarbon — Arene redirects here. For other uses, see Arene (disambiguation). An aromatic hydrocarbon or arene[1] (or sometimes aryl hydrocarbon)[2] is a hydrocarbon with alternating double and single bonds between carbon atoms. The term aromatic was… …
114Alkyl — An alkyl is a univalent radical consisting of carbon and hydrogen atoms, arranged in a chain. The alkyls form a homologous series with the general formula CnH2n+1. They include methyl , CH3· (named after methane ), ethyl (C2H5·), propyl (C3H7·),… …
115Protein structure — Proteins are an important class of biological macromolecules present in all biological organisms, made up of such elements as carbon, hydrogen, nitrogen, phosphorus, oxygen, and sulfur. All proteins are polymers of amino acids. The polymers, also …
116Amide — functional group Amides possess a conjugated system …
117Hydroxyl radical — IUPAC name Hydroxyl radical …
118Dalton, John — born Sept. 5 or 6, 1766, Eaglesfield, Cumberland, Eng. died July 27, 1844, Manchester British chemist and physicist. He spent most of his life in private teaching and research. His work on gases led him to state Dalton s law (see gas laws). He… …
119food preservation — Any method by which food is protected against spoilage by oxidation, bacteria, molds, and microorganisms. Traditional methods include dehydration, smoking, salting, controlled fermentation (including pickling), and candying; certain spices have… …
120Urey, Harold C. — ▪ American chemist Introduction in full Harold Clayton Urey born April 29, 1893, Walkerton, Ind., U.S. died Jan. 5, 1981, La Jolla, Calif. American scientist awarded the Nobel Prize for Chemistry in 1934 for his discovery of the heavy… …
