Aurous halides

The radii in the lowest row of the table were obtained by a number of approximate considerations. For instance, if we assume the bismuth radius to bear the same ratio to the interatomic distance in elementary bismuth as in the case of arsenic and antimony, we obtain (Bi) = 1.16— 1.47 A. A similar conclusion is reached from a study of NiSb and NiBi (with the nickel arsenide structure). Although the structures of the aurous halides have not been determined, it may be pointed out that if they are assumed to be tetrahedral (B3 or Bi) the interatomic distances in the chloride, bromide, and iodide calculated from the observed densities1) are 2.52, 2.66, and 2.75 A, to be compared with 2.19, 2.66, and 2.78 A, respectively, from pur table. 

The Ammines of Corps , Silver, and Gold—Ammino-derivatives of Cupric Sulphate—Hydroxylamine-derivatives of Cupric Sulphate—Cupro-ammino-sulphates—Ammino-salts of Cuprio Halides—Ammino-ouprous Halides— Ammino-derivatives of Silver Halides—Ammino-derivatives of Silver Nitrate —Ammino-derivatives of Gold Salts—Aurous Halides—Auric Halides— Derivatives of Auric Oxide, Auric Nitrate, Anrie Phosphate, Perohlorate— Derivatives of Mixed Salts. 

Aurous halides. Structural information is available only for Aul, which consists of chain molecules with the structure ... 

The mechanisms of the other methods of Intensification are more in doubt (cf. review by Sheppard el ah, 76). These methods include bathing the photographic material in a solution of silver salt, in a solution of hydrogen peroxide or sodium perborate (Vanselow et ah, 77), in a solution of aurous thiocyanate (James et ah, 31) or by fuming the material in the vapor of certain organic acids (Mueller and Bates, 78) or of ammonia. Such treatment may result in an increase in the effective size of the sub-nuclei, or simply in bringing about more favorable conditions for development at the silver/silver halide interface. 

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