Cadmium selenide

Cadmium selenide
	Unit cell, ball and stick model of cadmium selenide
	Sample of nanocrystalline cadmium selenide in a vial
Names
	IUPAC name Selanylidenecadmium
	Other names Cadmium(2+) selenide; Cadmium(II) selenide; , cadmoselite
Identifiers
CAS Number	1306-24-7 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:50834 ;
ChemSpider	14101 ;
ECHA InfoCard	100.013.772
EC Number	215-148-3;
Gmelin Reference	13656
MeSH	cadmium+selenide
PubChem CID	14784;
RTECS number	EV2300000;
UNII	A7F646JC5C ;
UN number	2570
CompTox Dashboard (EPA)	DTXSID1061651 ;
	InChI InChI=1S/Cd.Se Key: AQCDIIAORKRFCD-UHFFFAOYSA-N ; InChI=1/Cd.Se/rCdSe/c1-2 Key: AQCDIIAORKRFCD-BBSQRNTLAE;
	SMILES [Se]=[Cd];
Properties
Chemical formula	CdSe
Molar mass	191.385 g·mol−1
Appearance	Black, translucent, adamantine crystals
Odor	Odorless
Density	5.81 g cm−3
Melting point	1,240 °C (2,260 °F; 1,510 K)
Band gap	1.74 eV, both for hex. and sphalerite
Refractive index (nD)	2.5
Structure
Crystal structure	Wurtzite
Space group	C6v4-P63mc
Coordination geometry	Hexagonal
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H312, H331, H373, H410
Precautionary statements	P261, P273, P280, P301+P310, P311, P501
	NIOSH (US health exposure limits):
PEL (Permissible)	[1910.1027] TWA 0.005 mg/m3 (as Cd)
REL (Recommended)	Ca
IDLH (Immediate danger)	Ca [9 mg/m3 (as Cd)]
Related compounds
Other anions	Cadmium oxide,; Cadmium sulfide,; Cadmium telluride
Other cations	Zinc selenide,; Mercury(II) selenide
	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

Cadmium selenide is an inorganic compound with the formula Cd Se. It is a black to red-black solid that is classified as a II-VI semiconductor of the n-type. It is a pigment, but applications are declining because of environmental concerns.