Editing Mercury(II) oxide (section)

{{Chembox
|Verifiedfields = changed
|Watchedfields = changed
|verifiedrevid = 486593291
|ImageFile = HgOpowder.jpg
|ImageName = Mercury(II) oxide
|ImageFile1 = Montroydite-3D-ionic.png
|ImageName1 = Mercury(II) oxide
|IUPACName = Mercury(II) oxide
|OtherNames = Mercuric oxide<br />[[Montroydite]]<br />[[Red mercury]]
|Section1={{Chembox Identifiers
|CASNo = 21908-53-2
|CASNo_Ref = {{cascite|correct|CAS}}
|UNII_Ref = {{fdacite|correct|FDA}}
|UNII = IY191986AO
|UNNumber = 1641
|RTECS = OW8750000
|PubChem = 30856
|KEGG_Ref = {{keggcite|correct|kegg}}
|StdInChI_Ref = {{stdinchicite|correct|chemspider}}
|StdInChI = 1S/Hg.O
|StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
|StdInChIKey = UKWHYYKOEPRTIC-UHFFFAOYSA-N
|SMILES = [Hg]=O
|ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
|ChemSpiderID = 28626
|KEGG = C18670
}}
|Section2={{Chembox Properties
|Hg=1 | O=1
|Appearance = Yellow or red solid
|Odor = odorless
|Density = 11.14 g/cm<sup>3</sup>
|Solubility = 0.0053 g/100 mL (25&nbsp;°C) <br /> 0.0395 g/100 mL (100&nbsp;°C)
|SolubleOther = insoluble in [[ethanol|alcohol]], [[diethyl ether|ether]], [[acetone]], [[ammonia]]
|MeltingPtC = 500
|MeltingPt_notes = (decomposes)
|BandGap = 2.2 eV<ref name=landolt>{{cite book| chapter = Mercury oxide (HgO) crystal structure, physical properties| volume = 41B| doi = 10.1007/b71137| publisher = Springer-Verlag| year = 1999| pages = 1–7| isbn = 978-3-540-64964-9 |title=Semiconductors · II-VI and I-VII Compounds; Semimagnetic Compounds| series = Landolt-Börnstein - Group III Condensed Matter| editor1-last = Madelung| editor1-first = O| editor2-first = U| editor2-last = Rössler| editor3-first = M| editor3-last = Schulz}}</ref>
|RefractIndex = 2.5 (550 nm)<ref name=landolt/>
|MagSus = −44.0·10<sup>−6</sup> cm<sup>3</sup>/mol
}}
|Section3={{Chembox Thermochemistry
|DeltaHf = −90&nbsp;kJ·mol<sup>−1</sup><ref name=b1>{{cite book| author = Zumdahl, Steven S.|title =Chemical Principles 6th Ed.| publisher = Houghton Mifflin Company| year = 2009| isbn = 978-0-618-94690-7|page=A22}}</ref>
|Entropy = 70&nbsp;J·mol<sup>−1</sup>·K<sup>−1</sup><ref name=b1/>
}}
|Section4={{Chembox Hazards
|MainHazards = Extremely toxic, environmental pollutant
|ExternalSDS = [http://www.inchem.org/documents/icsc/icsc/eics0981.htm ICSC 0981]
|GHSPictograms = {{GHS06}} {{GHS08}} {{GHS09}}
|GHSSignalWord = Danger
|HPhrases = {{H-phrases|H300+H310+H330|H372|H410}}
|PPhrases = {{P-phrases|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}}
|GHS_ref = <ref>{{cite web|url=https://pubchem.ncbi.nlm.nih.gov/compound/30856#datasheet=LCSS|title=Laboratory Chemical Safety Summary (LCSS): Mercuric oxide|id=CID 30856|website=[[PubChem]]|publisher=[[National Center for Biotechnology Information]]|access-date=2022-04-14}}</ref>
|NFPA-H = 4
|NFPA-F = 0
|NFPA-R = 1
|NFPA_ref = <ref>{{cite web|url=https://www.fishersci.com/store/msds?partNumber=AC316791000&countryCode=US&language=en|format=PDF|title=Safety Data Sheet: Mercury(II) oxide|id=Cat No. AC316790000|publisher=[[Thermo Fisher Scientific]]|date=2021-12-25|access-date=2022-04-13}}</ref>
|FlashPt = Non-flammable
|LD50 = 18 mg/kg (oral, rat)<ref>{{cite web|url=https://chem.nlm.nih.gov/chemidplus/rn/21908-53-2|title=Mercuric oxide [ISO]|id=CAS RN: 21908-53-2|website=ChemIDPlus Advanced|publisher=[[United States National Library of Medicine]]|access-date=2022-04-14}}</ref>
}}
|Section5={{Chembox Related
|OtherAnions = [[Mercury sulfide]]<br />[[Mercury selenide]]<br />[[Mercury telluride]]
|OtherCations = [[Zinc oxide]]<br />[[Cadmium oxide]]
|OtherCompounds = [[Mercury(I) oxide]]
}}
}}

'''Mercury(II) oxide''', also called '''mercuric oxide''' or simply '''mercury oxide''', is the [[inorganic compound]] with the formula [[Mercury (element)|Hg]][[oxygen|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.