Beryllium hydride

Beryllium hydride
Names
	Other names Beryllium dihydride; Beryllium hydride; Beryllane
Identifiers
CAS Number	7787-52-2 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:33787 ;
ChemSpider	17215712 ;
PubChem CID	139073;
UNII	5M7P3TK96I ;
CompTox Dashboard (EPA)	DTXSID001027443 DTXSID4023913, DTXSID001027443 ;
	InChI InChI=1S/Be.2H Key: RWASOQSEFLDYLC-UHFFFAOYSA-N ; InChI=1/Be.2H/rBeH2/h1H2 Key: RWASOQSEFLDYLC-JICJMJRQAQ;
	SMILES [BeH2];
Properties
Chemical formula	BeH2
Molar mass	11.03 g mol−1
Appearance	white solid
Density	0.65 g/cm3
Melting point	250 °C (482 °F; 523 K) decomposes
Solubility in water	decomposes
Solubility	insoluble in diethyl ether, toluene
	Structure
Crystal structure	orthorhombic
Space group	Ibam, no. 72
Lattice constant	a = 4.1600 Å, b = 9.0820 Å, c = 7.7070 Å α = 90°, β = 90°, γ = 90°
Lattice volume (V)	291.18 Å3
Formula units (Z)	12
Thermochemistry
Heat capacity (C)	30.124 J/mol K
Hazards
	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 cations	lithium hydride, sodium hydride, magnesium hydride, calcium hydride, boron hydrides, aluminium hydride
Related compounds	beryllium fluoride
	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 hydride (systematically named poly[beryllane(2)] and beryllium dihydride) is an inorganic compound with the chemical formula (BeH
₂)_n (also written ([BeH
₂])_n or BeH
₂). This alkaline earth hydride is a colourless solid that is insoluble in solvents that do not decompose it. Unlike the ionically bonded hydrides of the heavier Group 2 elements, beryllium hydride is covalently bonded (three-center two-electron bond).