Radium iodide

Radium iodide
Names
	Other names Radium diiodide
Identifiers
CAS Number	20610-52-0 ;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/2HI.Ra/h2*1H;/q;;+2/p-2 Key: VIUODKCIIYIXHC-UHFFFAOYSA-L;
	SMILES [I-].[I-].[Ra+2];
Properties
Chemical formula	RaI2
Molar mass	480 g·mol−1
Appearance	yellow solid
Density	5.83 g/cm3
Solubility in water	soluble
Related compounds
Other anions	Radium fluoride; Radium chloride; Radium bromide;
Other cations	Beryllium iodide; Magnesium iodide; Calcium iodide; Strontium iodide; Barium iodide; Zinc iodide; Cadmium iodide; Mercury(II) iodide;
Related compounds	Hydrogen iodide; Lead(II) iodide;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Radium iodide is an inorganic compound of radium and iodine with the chemical formula Ra I₂.^[1]^[2] It is the radium salt of hydrogen iodide, consisting of radium cations Ra²⁺ and iodide anions I⁻.

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The salt is synthesized by the reaction of radium carbonate with hydroiodic acid:^[1]

RaCO₃ + 2 HI(aq) → RaI₂ + H₂O + CO₂

[1]
Weigel, F.; Trinkl, A. (1968). "Zur Kristallchemie des Radiums". Ract. 9: 36–41. doi:10.1524/ract.1968.9.1.36. S2CID 201843329.
[2]
Donnay, Joseph Désiré Hubert (1978). Crystal Data: Inorganic compounds 1967-1969. National Bureau of Standards. p. 0-160. Retrieved 7 June 2023.

Synthesis