What is Magnesium oxide?
{{Chembox | Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 414322178 | ImageFile = Magnesium oxide.jpg | ImageFile2 = NaCl polyhedra.png | IUPACName = Magnesium oxide | OtherNames = Magnesia<br/>[[Periclase]] |Section1=<!--{{Chembox Identifiers | CASNo = 1309-48-4 | CASNo_Ref = {{cascite|correct|CAS}} | EINECS = 215-171-9 | PubChem = 14792 | ChEMBL_Ref = {{ebicite|changed|EBI}} | ChEMBL = 1200572 | InChI = | RTECS = OM3850000 }}--> |Section2={{Chembox Properties | Formula = MgO | MolarMass = 40.304 g/mol<ref name=b92/> | Appearance = White powder | Odor = Odorless | Density = 3.6 g/cm<sup>3</sup><ref name=b92/> | MeltingPtC = 2852 | MeltingPt_ref=<ref name=b92>{{RubberBible92nd|page=4.74}}</ref> | BoilingPtC = 3600 | BoilingPt_ref=<ref name=b92/> | Solubility = | SolubleOther = Soluble in [[acid]], [[ammonia]] <br> insoluble in [[alcohol]] | ThermalConductivity = 45–60&nbsp;W·m<sup>−1</sup>·K<sup>−1</sup><ref>[http://www.konoshima.co.jp/en/resdev/004.html Application of magnesium compounds to insulating heat-conductive fillers] {{webarchive|url=https://web.archive.org/web/20131230233440/http://www.konoshima.co.jp/en/resdev/004.html |date=2013-12-30 }}. konoshima.co.jp</ref> | RefractIndex = 1.7355 | BandGap = 7.8 eV<ref>{{cite journal |journal=Solid State Communications |volume=55 |year=1985 |pages=351–5 |title=Self-consistent electronic structures of MgO and SrO |first1=O.E. |last1=Taurian |doi=10.1016/0038-1098(85)90622-2 |last2=Springborg |first2=M. |last3=Christensen |first3=N.E. |issue=4 |url=http://users-phys.au.dk/nec/Papers/necSSC/SSC55351.pdf |bibcode=1985SSCom..55..351T |access-date=2014-03-31 |archive-date=2016-03-03 |archive-url=https://web.archive.org/web/20160303213012/http://users-phys.au.dk/nec/Papers/necSSC/SSC55351.pdf |url-status=dead }}</ref> | Dipole = 6.2 ± 0.6 D | MagSus = −10.2·10<sup>−6</sup> cm<sup>3</sup>/mol<ref>{{RubberBible92nd|page=4.133}}</ref> }} |Section3={{Chembox Structure | CrystalStruct = [[Halite]] (cubic), [[Pearson symbol|cF8]] | SpaceGroup = Fm<u