a history of the concept of valency

acid affinity ammonia ammonium angular momentum Arrhenius atomic weights Baeyer bases benzene Berzelius binding bonds C₁H5 cacodyl oxide carbon carbon atoms CH₂ chem Chemical Society chemical union chemistry chemists Chim chlorine co-ordination combination complex compounds concept of valency constitution contain Couper crystal Dalton derivatives dissociation dissymmetrical dtsch dualistic theory electrical electrolytic electron spin energy equivalent ethylene example Faraday fluorine Frankland function graphic formulae groups H H H H₂ H₂C HC CH heat hydrogen atoms inert elements isomeric isomers John Dalton Kekulé Lecture Liebigs Ann London Lothar Meyer Mendeleef metals molecular molecules negative nitric acid nitrogen number of atoms number of electrons orbital organic chemistry oxide oxygen pairs paper particles Pasteur periodic law periodic system Phys physical polar positive principle properties quantum numbers radical salts saturated solution stable sulphur symmetrical tartaric acids theory of valency tion univalent van't Hoff Werner zinc