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.

^ ^a ^b Madelung, O; Rössler, U; Schulz, M, eds. (1999). "Mercury oxide (HgO) crystal structure, physical properties". Semiconductors · II-VI and I-VII Compounds; Semimagnetic Compounds. Landolt-Börnstein - Group III Condensed Matter. Vol. 41B. Springer-Verlag. pp. 1–7. doi:10.1007/b71137. ISBN 978-3-540-64964-9.
^ ^a ^b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A22. ISBN 978-0-618-94690-7.
^ "Mercuric oxide [ISO]". ChemIDPlus Advanced. United States National Library of Medicine. CAS RN: 21908-53-2. Retrieved 2022-04-14.
^ "Laboratory Chemical Safety Summary (LCSS): Mercuric oxide". PubChem. National Center for Biotechnology Information. CID 30856. Retrieved 2022-04-14.
^ "Safety Data Sheet: Mercury(II) oxide" (PDF). Thermo Fisher Scientific. 2021-12-25. Cat No. AC316790000. Retrieved 2022-04-13.

[landolt-1] Madelung, O; Rössler, U; Schulz, M, eds. (1999). "Mercury oxide (HgO) crystal structure, physical properties". Semiconductors · II-VI and I-VII Compounds; Semimagnetic Compounds. Landolt-Börnstein - Group III Condensed Matter. Vol. 41B. Springer-Verlag. pp. 1–7. doi:10.1007/b71137. ISBN 978-3-540-64964-9.

[b1-2] Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A22. ISBN 978-0-618-94690-7.

[3] "Mercuric oxide [ISO]". ChemIDPlus Advanced. United States National Library of Medicine. CAS RN: 21908-53-2. Retrieved 2022-04-14.

[4] "Laboratory Chemical Safety Summary (LCSS): Mercuric oxide". PubChem. National Center for Biotechnology Information. CID 30856. Retrieved 2022-04-14.

[5] "Safety Data Sheet: Mercury(II) oxide" (PDF). Thermo Fisher Scientific. 2021-12-25. Cat No. AC316790000. Retrieved 2022-04-13.

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Names


IUPAC name Mercury(II) oxide
Other names Mercuric oxide Montroydite Red mercury
Identifiers
CAS Number	21908-53-2^Y
3D model (JSmol)	Interactive image
ChemSpider	28626^Y
ECHA InfoCard	100.040.580
KEGG	C18670^Y
PubChem CID	30856
RTECS number	OW8750000
UNII	IY191986AO^Y
UN number	1641
CompTox Dashboard (EPA)	DTXSID4042125
InChI InChI=1S/Hg.O^Y Key: UKWHYYKOEPRTIC-UHFFFAOYSA-N^Y
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^[1]
Magnetic susceptibility (χ)	−44.0·10⁻⁶ cm³/mol
Refractive index (n_D)	2.5 (550 nm)^[1]
Thermochemistry
Std molar entropy (S^⦵₂₉₈)	70 J·mol⁻¹·K⁻¹^[2]
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	−90 kJ·mol⁻¹^[2]
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Extremely toxic, environmental pollutant
GHS labelling:^[4]
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)	^[5] 4 0 1
Flash point	Non-flammable
Lethal dose or concentration (LD, LC):
LD₅₀ (median dose)	18 mg/kg (oral, rat)^[3]
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). N verify (what is ^YN ?) Infobox references