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Aurous bromide, AuBr, is a yellowish-green powder obtained by heating the tribromide to 140�; auric bromide, AuBr3, forms reddish-black or scarlet-red leafy crystals, which dissolve in water to form a reddish-brown solution, and combines with bromides to form bromaurates corresponding to the chloraurates.

Arsenic tribromide, AsBr3, is formed by the direct union of arsenic and bromine, and subsequent distillation from the excess of arsenic; it forms colourless deliquescent prisms which melt at 20�-25� C., and boil at 220� C. Water decomposes it, a small quantity of water leading to the formation of the oxybromide, AsOBr, whilst a large excess of water gives arsenious oxide, As4O6.

Arsenic trifiuoride, AsF3, is prepared by distilling white arsenic with fluorspar and sulphuric acid, or by heating arsenic tribromide with ammonium fluoride; it is a colourless liquid of specific gravity 2.73, boiling at 63� C.; it fumes in air, and in contact with the skin produces painful wounds.

Compounds of antimony with all the halogen elements are known, one atom of the metal combining with three or five atoms of the halogen, except in the case of bromine, where only the tribromide is known.

Antimony tribromide, SbBr3, and tri-iodide, SbI3, may be prepared by the action of antimony on solutions of bromine or iodine in carbon bisulphide.