Radium nitrate

Radium nitrate is a radioactive salt with the formula Ra(NO₃)₂. It is a white solid, but old samples appear yellowish-grey. Although radium chloride and radium bromide are less soluble than the corresponding barium salts, radium nitrate is more soluble than barium nitrate.^[1][2] It decomposes at 280 °C to radium oxide.^{[citation needed]}

Radium nitrate

Names
Other names Radium(II) nitrate Radium dinitrate
Identifiers
CAS Number	10213-12-4
3D model (JSmol)	Interactive image
ChemSpider	67037400
InChI InChI=1S/2NO3.Ra/c2*2-1(3)4;/q2*-1;+2 Key: AMLSLPXXUHKKSF-UHFFFAOYSA-N
SMILES [Ra+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O
Properties
Chemical formula	Ra(NO3)2
Molar mass	350.01 g/mol
Appearance	White solid[1]
Melting point	280 °C (536 °F; 553 K) (decomposes)
Solubility in water	13.9 g/100 ml
Solubility in nitric acid	Insoluble
Related compounds
Other anions	Radium carbonate
Other cations	Barium nitrate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Production

Radium nitrate is produced by the reaction of radium carbonate or radium sulfate with nitric acid:^[2]

RaCO₃ + HNO₃ → Ra(NO₃)₂ + CO₂ + H₂O