Abstract
Published experimental results plus a limited amount of new data show that chemisorbed hydrogen on nickel must consist of an atom carrying a negative charge. The nickel atom most affected retains a magnetic moment but loses its ability to participate in ferromagnetic exchange interaction. It retains most of its other properties as part of the metal particle. The stoichiometry is one hydrogen to one nickel with minor peripheral effects. There is no change of stoichiometry, or of bonding mode, over the whole range of surface coverage or, within limits, of temperature change. The bonding is quite different from that in nickel hydride.
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