Радий хлориді: қасиеттері мен қолданылуы

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|Verifiedfields = changed
|Watchedfields = changed
|verifiedrevid = 464379743
|Name = Radium chloride
|ImageFile = US radium standard 1927. jpg
|ImageSize = 120px
|ImageCaption = An ampoule containing radium chloride
|Section1=
|Section2=Chembox Properties
|Appearance = Colorless solid, glows blue green
|Formula = |RaCl2
|Density = 4.9 g/cm3
|MeltingPtC = 900
|MeltingPt ref = The first preparation of radium metal was by the electrolysis of a solution of this salt using a mercury cathode.

Radium chloride crystallises from aqueous solution as the dihydrate. The dihydrate is dehydrated by heating to 100 °C in air for one hour followed by 5.5 hours at 520 °C under argon. If the presence of other anions is suspected, the dehydration may be effectuated by fusion under hydrogen chloride. Radium chloride can also be prepared by heating radium bromide in a flow of dry hydrogen chloride gas. It can be produced by treating radium carbonate with hydrochloric acid.

Radium chloride is a colorless salt with a blue green luminescence, especially when heated. Its color gradually changes to yellow with aging, whereas contamination by barium may impart a rose tint. Gaseous |RaCl2 shows strong absorptions in the visible spectrum at 676.3 nm and 649.8 nm (red): the dissociation energy of the radium–chlorine bond is estimated as 2.9 eV, and its length as 292 pm. Contrary to diamagnetic barium chloride, radium chloride is weakly paramagnetic with a magnetic susceptibility of 1.05. Its flame color is red. Radium 223 dichloride (USP, radium chloride Ra 223), tradename Xofigo (formerly Alpharadin), is an alpha emitting radiopharmaceutical. Bayer received FDA approval for this drug to treat prostate cancer osteoblastic bone metastases in May 2013. Radium 223 chloride is one of the most potent ((antineoplastic drugs)) known. One dose (50 kBq/kg) in an adult is about 60 nanograms; this amount is 1/1000 the weight of an eyelash (75 micrograms).