Atomic hydrogen (or nascent hydrogen) consists of individual hydrogen atoms that are not bound together like those in ordinary hydrogen molecules. The species is denoted by H (atomic), contrasted with the usual H2 (dihydrogen or just 'hydrogen') commonly involved in chemical reactions. It is claimed to exist transiently but long enough to effect chemical reactions. According to one claim, nascent hydrogen is generated in situ usually by the reaction of zinc with an acid, aluminium (Devarda's alloy) with sodium hydroxide, or by electrolysis at the cathode. Being monoatomic, H atoms are much more reactive and thus a much more effective reducing agent than ordinary diatomic H2, but again the key question is whether H atoms exist in any chemically meaningful way under the conditions claimed. The concept is more popular in engineering and in older literature on catalysis.
Other articles related to "nascent hydrogen, hydrogen, nascent":
... Occasionally, hydrogen chemisorbed on metal surfaces is referred to as "nascent", although this terminology is fading with time ... Other views hold that such chemisorbed hydrogen is "a bit less reactive than nascent hydrogen because of the bonds provided by the catalyst metal surface" ... Also, such catalyst provided atoms are not called nascent hydrogen, because they do not need to be captured and reacted in their instantaneous, temporary, "just generated" state, because the catalyst is able to ...
... Since the mid-19th century the existence of true nascent hydrogen was repeatedly challenged ... It was assumed by the supporters of this theory that before that two hydrogen atoms can recombine into a more stable H2 molecule, the labile H· free ... Nascent hydrogen was supposed to be responsible of the reduction of arsenate or nitrate in arsine or ammonia respectively ...
Famous quotes containing the words hydrogen and/or nascent:
“The pace of science forces the pace of technique. Theoretical physics forces atomic energy on us; the successful production of the fission bomb forces upon us the manufacture of the hydrogen bomb. We do not choose our problems, we do not choose our products; we are pushed, we are forcedby what? By a system which has no purpose and goal transcending it, and which makes man its appendix.”
—Erich Fromm (19001980)
“A work can become modern only if it is first postmodern. Postmodernism thus understood is not modernism at its end but in the nascent state, and this state is constant.”
—Jean François Lyotard (b. 1924)