Disodium helide

Disodium helide
Identifiers
3D model (JSmol)	Interactive image;
	InChI InChI=1S/He.2Na Key: JTZHEFJRNNBIOK-UHFFFAOYSA-N;
	SMILES [Na].[Na].[He];
Properties
Chemical formula	HeNa2
Molar mass	49.982141 g·mol−1
Structure
Crystal structure	Fluorite, cF12
Space group	Fm3m, #225
Lattice constant	a = 3.95 Å at 300 GPa
Related compounds
Other cations	Lithium helium
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Disodium helide (Na₂He) is a compound of helium and sodium that is stable at high pressures above 113 gigapascals (1,130,000 bar). It was first predicted using the USPEX crystal structure prediction algorithm and then synthesised in 2016.

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