Beryllium iodide

Beryllium iodide
Names
	Systematic IUPAC name Beryllium iodide
Identifiers
CAS Number	7787-53-3 ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	74209 ;
ECHA InfoCard	100.029.199
PubChem CID	82231;
UNII	9E9VD36EWN ;
CompTox Dashboard (EPA)	DTXSID9064849 ;
	InChI InChI=1S/Be.2HI/h;21H/q+2;;/p-2 Key: JUCWKFHIHJQTFR-UHFFFAOYSA-L ; InChI=1/Be.2HI/h;21H/q+2;;/p-2 Key: JUCWKFHIHJQTFR-NUQVWONBAT;
	SMILES I[Be]I; I[Be-2](I)([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1(I)I;
Properties
Chemical formula	BeI2
Molar mass	262.82112 g·mol−1
Appearance	colorless needle-like crystals
Density	4.325 g/cm3
Melting point	480 °C (896 °F; 753 K)
Boiling point	590 °C (1,094 °F; 863 K)
Solubility in water	reacts with water
Solubility	Slightly soluble in CS2; Soluble in ethanol, diethyl ether
Structure
Crystal structure	orthorhombic
Thermochemistry
Heat capacity (C)	71.14 J/(mol·K)
Std molar; entropy (S⦵298)	130 J/(mol·K)
Std enthalpy of; formation (ΔfH⦵298)	−192.62 kJ/mol
Gibbs free energy (ΔfG⦵)	−210 kJ/mol
Std enthalpy of; combustion (ΔcH⦵298)	19 kJ/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	see Berylliosis
NFPA 704 (fire diamond)	3 3 2 W
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 0.002 mg/m3; C 0.005 mg/m3 (30 minutes), with a maximum peak of 0.025 mg/m3 (as Be)
REL (Recommended)	Ca C 0.0005 mg/m3 (as Be)
IDLH (Immediate danger)	Ca [4 mg/m3 (as Be)]
Related compounds
Other anions	Beryllium fluoride; Beryllium chloride; Beryllium bromide;
Other cations	Magnesium iodide; Calcium iodide; Strontium iodide; Barium iodide; Radium iodide;
Related compounds	Hydrogen iodide; Zinc 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

Beryllium iodide is an inorganic compound with the chemical formula Be I₂. It is a hygroscopic white solid. The Be²⁺ cation, which is relevant to salt-like BeI₂, is characterized by the highest known charge density (Z/r = 6.45), making it one of the hardest cations and a very strong Lewis acid.