Editing Molybdenum (section)

===Physical properties===
In its pure form, molybdenum is a silvery-grey metal with a [[Mohs scale of mineral hardness|Mohs hardness]] of 5.5 and a standard atomic weight of 95.95&nbsp;g/mol.<ref>{{cite journal |author1=Wieser, M. E. |author2=Berglund, M. |s2cid=98084907 |date=2009 |title=Atomic weights of the elements 2007 (IUPAC Technical Report) |url=http://www.ciaaw.org/pubs/TSAW2007.pdf |journal=[[Pure and Applied Chemistry]] |volume=81 |issue=11 |pages=2131–2156 |doi-access=free |s2cid-access=free |doi=10.1351/PAC-REP-09-08-03 |access-date=2012-02-13 |archive-url=https://web.archive.org/web/20120311194819/http://www.ciaaw.org/pubs/TSAW2007.pdf |archive-date=2012-03-11}}</ref><ref>{{cite web |url=http://www.ciaaw.org/atomic_weights3.htm |title=Current Table of Standard Atomic Weights in Alphabetical Order: Standard Atomic weights of the elements |date=2013 |last=Meija |first=Juris |display-authors=etal |publisher=Commission on Isotopic Abundances and Atomic Weights |archive-url=https://web.archive.org/web/20140429050401/http://www.ciaaw.org/atomic_weights3.htm |archive-date=2014-04-29 }}</ref> It has a [[melting point]] of {{convert|2623|°C|°F}}, sixth highest of the naturally occurring elements; only [[tantalum]], [[osmium]], [[rhenium]], [[tungsten]], and [[carbon]] have higher melting points.<ref name="CRCdescription2" /> It has one of the lowest coefficients of [[thermal expansion]] among commercially used metals.<ref name="nbb">{{cite book |last=Emsley |first=John |title=Nature's Building Blocks |url=https://books.google.com/books?id=j-Xu07p3cKwC&pg=PA265 |publisher=Oxford University Press |date=2001 |location=Oxford |pages=262–266 |isbn=978-0-19-850341-5}}</ref>