Sodium iodide

Sodium iodide
	NaI(Tl) scintillators
Identifiers
CAS Number	7681-82-5 ; 13517-06-1 (dihydrate) ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:33167 ;
ChEMBL	ChEMBL1644695 ;
ChemSpider	5048 ;
ECHA InfoCard	100.028.800
PubChem CID	5238;
RTECS number	WB6475000;
UNII	F5WR8N145C ;
CompTox Dashboard (EPA)	DTXSID2041125 ;
	InChI InChI=1S/HI.Na/h1H;/q;+1/p-1 Key: FVAUCKIRQBBSSJ-UHFFFAOYSA-M ; InChI=1/HI.Na/h1H;/q;+1/p-1 Key: FVAUCKIRQBBSSJ-REWHXWOFAL;
	SMILES [Na+].[I-];
Properties
Chemical formula	NaI
Molar mass	149.894
Appearance	white solid ; deliquescent
Odor	odorless
Density	3.67 g cm−3
Melting point	661 °C (1,222 °F; 934 K)
Boiling point	1,304 °C (2,379 °F; 1,577 K)
Solubility in water	1587 g/L (0 °C) ; 1842 g/L (25 °C) ; 2278 g/L (50 °C) ; 2940 g/L (70 °C) ; 3020 g/L (100 °C)
Solubility	ethanol, acetone
Band gap	5.89 eV
Magnetic susceptibility (χ)	−57×10−6 cm3 mol−1
Refractive index (nD)	1.93 (300 nm); 1.774 (589 nm); 1.71 (10 μm)
Structure
Crystal structure	Halite, cF8
Space group	Fm3m, No. 225
Lattice constant	a = 0.6462 nm
Formula units (Z)	4
Coordination geometry	Octahedral
Thermochemistry
Heat capacity (C)	52.1 J mol−1 K−1
Std molar; entropy (S⦵298)	98.5 J mol−1 K−1
Std enthalpy of; formation (ΔfH⦵298)	−287.8 kJ mol−1
Gibbs free energy (ΔfG⦵)	−286.1 kJ mol−1
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Irritant, can harm the unborn child
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H315, H319, H400
Precautionary statements	P273, P305+P351+P338
NFPA 704 (fire diamond)	1 0 1
Flash point	Non-flammable
Safety data sheet (SDS)
Related compounds
Other anions	Sodium fluoride; Sodium chloride; Sodium bromide; Sodium astatide
Other cations	Lithium iodide; Potassium iodide; Rubidium iodide; Caesium iodide; Francium iodide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Sodium iodide (chemical formula NaI) is an ionic compound formed from the chemical reaction of sodium metal and iodine. Under standard conditions, it is a white, water-soluble solid comprising a 1:1 mix of sodium cations (Na⁺) and iodide anions (I⁻) in a crystal lattice. It is used mainly as a nutritional supplement and in organic chemistry. It is produced industrially as the salt formed when acidic iodides react with sodium hydroxide. It is a chaotropic salt.