Mercury(II) oxide

Mercury(II) oxide
Names
	IUPAC name Mercury(II) oxide
	Other names Mercuric oxide; Montroydite; Red mercury
Identifiers
CAS Number	21908-53-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	28626 ;
ECHA InfoCard	100.040.580
KEGG	C18670 ;
PubChem CID	30856;
RTECS number	OW8750000;
UNII	IY191986AO ;
UN number	1641
CompTox Dashboard (EPA)	DTXSID4042125 ;
	InChI InChI=1S/Hg.O Key: UKWHYYKOEPRTIC-UHFFFAOYSA-N ;
	SMILES [Hg]=O;
Properties
Chemical formula	HgO
Molar mass	216.591 g·mol−1
Appearance	Yellow or red solid
Odor	odorless
Density	11.14 g/cm3
Melting point	500 °C (932 °F; 773 K) (decomposes)
Solubility in water	0.0053 g/100 mL (25 °C) ; 0.0395 g/100 mL (100 °C)
Solubility	insoluble in alcohol, ether, acetone, ammonia
Band gap	2.2 eV
Magnetic susceptibility (χ)	−44.0·10−6 cm3/mol
Refractive index (nD)	2.5 (550 nm)
Thermochemistry
Std molar; entropy (S⦵298)	70 J·mol−1·K−1
Std enthalpy of; formation (ΔfH⦵298)	−90 kJ·mol−1
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Extremely toxic, environmental pollutant
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300+H310+H330, H372, H410
Precautionary statements	P260, P262, P264, P270, P271, P273, P280, P284, P301+P316, P302+P352, P304+P340, P316, P320, P321, P330, P361+P364, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	4 0 1
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	18 mg/kg (oral, rat)
Safety data sheet (SDS)	ICSC 0981
Related compounds
Other anions	Mercury sulfide; Mercury selenide; Mercury telluride
Other cations	Zinc oxide; Cadmium oxide
Related compounds	Mercury(I) oxide
	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

Mercury(II) oxide, also called mercuric oxide or simply mercury oxide, is the inorganic compound with the formula Hg O. It has a red or orange color. Mercury(II) oxide is a solid at room temperature and pressure. The mineral form montroydite is very rarely found.

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