Molybdenum is a Block D, Group 6, Period 5 element. The number of electrons in each of Molybdenum's shells is 2, 8, 18, 13, 1 and its electronic configuration is [Kr] 4d5 5s1. In its elemental form molybdenum's CAS number is 7439-98-7. The molybdenum atom has a radius of 136.3.pm and it's Van der Waals radius is 200.pm. Molybdenum is toxic unless it is in small quantities. Molybdenum has the third highest melting point of any element, exceeded only by tungsten and tantalum. Molybdenum is a catalyst in the oil refining. It has many other applications, including in catalysts, pigments, corrosion inhibitors and lubricants. It has a very high elastic modulus. Molybdenum is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity); metals in the form of foil, sputtering target, and rod, and compounds as submicron and nanopowder. It is used in steel alloys to add hardness and raise melting points. It is a component in Hastelloys brand steel. Molybdenum is used in nuclear reactors and aerospace components. Molybdenum was first discovered by Carl Wilhelm in 1778. The origin of the name Molybdenum comes from the Greek word molubdos meaning lead. See Molybdenum research below.
Rhenium is a Block D, Group 7, Period 6 element. The number of electrons in each of Rhodium's shells is 2, 8, 18, 32, 13, 2 and its electronic configuration is [Xe] 4f14 5d5 6s2. In its elemental form rhenium's CAS number is 7440-15-5. The rhenium atom has a radius of 137.1.pm and it's Van der Waals radius is 200.pm. The toxicity of Rhenium has not yet been established . Rhenium is the fourth densestelementexceeded only by that of platinum, iridium, and osmium . It has the second highest melting point exceeded only by tungsten and carbon . Rhenium is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity); metals in the form of foil, sputtering target, and rod, and compounds as submicron and nanopowder. Because of this, thermocouples made of Tungsten/Rhenium alloy is are used when temperatures will rise to 2000 C and rhenium wire is used in photoflash lamps for photography. It is widely used as filaments for mass spectrographs and ion gauges. Rhenium was first discovered by Walter Noddack in 1925 in the Rhine region of Germany. The name Rhenium originates from the Latin word 'Rhenus' meaning "Rhine" after the place of discovery. See Rhenium research below.
Process development for the separation and recovery of Mo and Co from chloride leach liquors of petroleum refining catalyst by solvent extraction.
Banda R, Sohn SH, Lee MS.
J Hazard Mater. 2012 Jan 9. [Epub ahead of print]
PMID:
22336581
[PubMed - as supplied by publisher]
Selective cleavage of pepsin by molybdenum metallopeptidase.
Yenjai S, Malaikaew P, Liwporncharoenvong T, Buranaprapuk A.
Biochem Biophys Res Commun. 2012 Feb 5. [Epub ahead of print]
PMID:
22330807
[PubMed - as supplied by publisher]
Iminopyridine Complexes of Manganese, Rhenium, and Molybdenum Derived from Amino Ester Methylserine and Peptides Gly-Gly, Gly-Val, and Gly-Gly-Gly: Self-Assembly of the Peptide Chains.
Alvarez CM, García-Rodríguez R, Miguel D.
Inorg Chem. 2012 Feb 13. [Epub ahead of print]
PMID:
22329711
[PubMed - as supplied by publisher]
Low-Temperature, Solution-Processed MoO(x) for Efficient and Stable Organic Solar Cells.
Zilberberg K, Gharbi H, Behrendt A, Trost S, Riedl T.
ACS Appl Mater Interfaces. 2012 Feb 15. [Epub ahead of print]
PMID:
22324481
[PubMed - as supplied by publisher]
A molecular MoS? edge site mimic for catalytic hydrogen generation.
Karunadasa HI, Montalvo E, Sun Y, Majda M, Long JR, Chang CJ.
Science. 2012 Feb 10;335(6069):698-702.
PMID:
22323816
[PubMed - in process]
The use of total reflectance X-ray fluorescence (TXRF) for the determination of metals in the pharmaceutical industry.
Antosz FJ, Xiang Y, Diaz AR, Jensen AJ.
J Pharm Biomed Anal. 2012 Jan 16. [Epub ahead of print]
PMID:
22316622
[PubMed - as supplied by publisher]
Kinetic Resolution of Planar-Chiral (?(6) -Arene)Chromium Complexes by Molybdenum-Catalyzed Asymmetric Ring-Closing Metathesis.
Ogasawara M, Wu WY, Arae S, Watanabe S, Morita T, Takahashi T, Kamikawa K.
Angew Chem Int Ed Engl. 2012 Feb 3. doi: 10.1002/anie.201108292. [Epub ahead of print]
PMID:
22308166
[PubMed - as supplied by publisher]
Measurement of mass attenuation coefficients of Rhizophora spp. binderless particleboards in the 16.59-25.26keV photon energy range and their density profile using x-ray computed tomography.
Marashdeh MW, Bauk S, Tajuddin AA, Hashim R.
Appl Radiat Isot. 2012 Jan 20. [Epub ahead of print]
PMID:
22304963
[PubMed - as supplied by publisher]
Nitrite and Nitrite Reductases: From Molecular Mechanisms to Significance in Human Health and Disease.
Castiglione N, Rinaldo S, Giardina G, Stelitano V, Cutruzzolà F.
Antioxid Redox Signal. 2012 Feb 5. [Epub ahead of print]
PMID:
22304560
[PubMed - as supplied by publisher]
Molybdenum(vi) catalysts obtained from ?(3)-allyl dicarbonyl precursors: Synthesis, characterization and catalytic performance in cyclooctene epoxidation.
Gamelas CA, Gomes AC, Bruno SM, Almeida Paz FA, Valente AA, Pillinger M, Romão CC, Gonçalves IS.
Dalton Trans. 2012 Feb 2. [Epub ahead of print]
PMID:
22302175
[PubMed - as supplied by publisher]
Field-Effect Tunneling Transistor Based on Vertical Graphene Heterostructures.
Britnell L, Gorbachev RV, Jalil R, Belle BD, Schedin F, Mishchenko A, Georgiou T, Katsnelson MI, Eaves L, Morozov SV, Peres NM, Leist J, Geim AK, Novoselov KS, Ponomarenko LA.
Science. 2012 Feb 2. [Epub ahead of print]
PMID:
22300848
[PubMed - as supplied by publisher]
Spectroscopic reflectometry of mirror surfaces during plasma exposure.
Wisse M, Eren B, Marot L, Steiner R, Meyer E.
Rev Sci Instrum. 2012 Jan;83(1):013509.
PMID:
22299953
[PubMed - in process]
[Absorption characteristics of molybdenum by reed and cattail].
Lian JJ, Xu SG, Han CW.
Huan Jing Ke Xue. 2011 Nov;32(11):3335-40. Chinese.
PMID:
22295632
[PubMed - in process]
Conserved Signal Peptide Recognition Systems across the Prokaryotic Domains.
Coulthurst SJ, Dawson A, Hunter WN, Sargent F.
Biochemistry. 2012 Feb 13. [Epub ahead of print]
PMID:
22289056
[PubMed - as supplied by publisher]
Two methods can simultaneously display both intramuscular nerves and blood vessels.
Yu DZ, Liu AT, Zhang JL, Dang RS, Chen G, Liu BL, Han T, Yi J, Nagasao T, Jiang H.
Plast Reconstr Surg. 2012 Feb;129(2):401-11.
PMID:
22286423
[PubMed - in process]
Synthesis, characterization and biological activities of some new chromium molybdenum and tungsten complexes with 2,6-diaminopyridine.
Soliman AA, Ali SA, Marei AH, Nassar DH.
Spectrochim Acta A Mol Biomol Spectrosc. 2012 Apr;89:329-32. Epub 2011 Dec 30.
PMID:
22286054
[PubMed - in process]
Tuning the Photochromic Properties of Molybdenum Bisphosphonate Polyoxometalates.
El Moll H, Dolbecq A, Mbomekalle IM, Marrot J, Deniard P, Dessapt R, Mialane P.
Inorg Chem. 2012 Jan 27. [Epub ahead of print]
PMID:
22283587
[PubMed - as supplied by publisher]
In vivo evaluation of defined polished titanium surfaces to prevent soft tissue adhesion.
Hayes JS, Welton JL, Wieling R, Richards RG.
J Biomed Mater Res B Appl Biomater. 2012 Jan 27. doi: 10.1002/jbm.b.31967. [Epub ahead of print]
PMID:
22282225
[PubMed - as supplied by publisher]
Reaction dynamics of Mo + O(2) ? MoO + O studied by a crossed-beam velocity map imaging technique.
Honma K, Matsumoto Y.
J Chem Phys. 2012 Jan 21;136(3):034301.
PMID:
22280754
[PubMed - in process]
A new class of electrocatalysts for hydrogen production from water electrolysis: metal monolayers supported on low-cost transition metal carbides.
Esposito DV, Hunt ST, Kimmel YC, Chen JG.
J Am Chem Soc. 2012 Feb 15;134(6):3025-33. Epub 2012 Feb 1.
PMID:
22280370
[PubMed - in process]
Mechanism of visible-light photoisomerization of a rhenium(i) carbonyl-diimine complex.
Gindensperger E, Köppel H, Daniel C.
Chem Commun (Camb). 2010 Sep 28. [Epub ahead of print]PMID: 20877849 [PubMed - as supplied by publisher]Related citations
Novel rhenium nitrides.
Friedrich A, Winkler B, Bayarjargal L, Morgenroth W, Juarez-Arellano EA, Milman V, Refson K, Kunz M, Chen K.
Phys Rev Lett. 2010 Aug 20;105(8):085504. Epub 2010 Aug 20.PMID: 20868112 [PubMed - in process]Related citations
Effect of rhenium on the dislocation core structure in tungsten.
Romaner L, Ambrosch-Draxl C, Pippan R.
Phys Rev Lett. 2010 May 14;104(19):195503. Epub 2010 May 13.PMID: 20866976 [PubMed - in process]Related citations
Highly Emitting Concomitant Polymorphic Crystals of a Dinuclear Rhenium Complex.
Quartapelle Procopio E, Mauro M, Panigati M, Donghi D, Mercandelli P, Sironi A, D'Alfonso G, De Cola L.
J Am Chem Soc. 2010 Sep 24. [Epub ahead of print]PMID: 20866093 [PubMed - as supplied by publisher]Related citations
Pyridyl-Cyclopentadiene Re(CO)(2) Complexes as a Compact Core Systems for SPECT Ligand Development.
Ackroyd NC, Katzenellenbogen JA.
Organometallics. 2010 Aug 23;29(16):3669-3671.PMID: 20865134 [PubMed]Related citations.
Postlumpectomy Focal Brachytherapy for Simultaneous Treatment of Surgical Cavity and Draining Lymph Nodes.
Hrycushko BA, Li S, Shi C, Goins B, Liu Y, Phillips WT, Otto PM, Bao A.
Int J Radiat Oncol Biol Phys. 2010 Sep 23. [Epub ahead of print]PMID: 20864271 [PubMed - as supplied by publisher]Related citations
Radioimmunotherapy with antibody to HPV16 E6 oncoprotein is effective in experimental cervical tumor expressing low levels of E6.
Phaeton R, Harris M, Jiang Z, Wang XG, Einstein MH, Goldberg GL, Casadevall A, Dadachova E.
Cancer Biol Ther. 2010 Nov 12;10(10). [Epub ahead of print]PMID: 20861673 [PubMed - as supplied by publisher]Related citations
Correction to Synthesis and Characterization of Luminescent Rhenium(I) Tricarbonyl Diimine Complexes with a Triarylboron Moiety and the Study of Their Fluoride Ion-Binding Properties.
Lam ST, Zhu N, Yam VW.
Inorg Chem. 2010 Sep 20. [Epub ahead of print] No abstract available. PMID: 20853863 [PubMed - as supplied by publisher]Related citations
86Y-CHX-A"-Rhenium-cyclized-[Cys3,4,10,D-Phe7,Arg11]a-MSH3-13 .
Leung K.
Molecular Imaging and Contrast Agent Database (MICAD) [Internet]. Bethesda (MD): National Center for Biotechnology Information (US); 2004-2010.
2009 Aug 20 [updated 2010 Sep 8].PMID: 20845549 [PubMed]Books & DocumentsFree textRelated citations
68Ga-CHX-A"-Rhenium-cyclized-[Cys3,4,10,D-Phe7,Arg11]a-MSH3-13 .
Leung K.
Molecular Imaging and Contrast Agent Database (MICAD) [Internet]. Bethesda (MD): National Center for Biotechnology Information (US); 2004-2010.
2009 Aug 20 [updated 2010 Sep 8].PMID: 20845548 [PubMed]Books & DocumentsFree textRelated citations
Therapeutic nuclear medicine in pediatric malignancy.
Schmidt M, Baum RP, Simon T, Howman-Giles R.
Q J Nucl Med Mol Imaging. 2010 Aug;54(4):411-28.PMID: 20823809 [PubMed - in process]Related citations
Rhenium(i) and platinum(ii) complexes with diimine ligands bearing acidic phenol substituents: hydrogen-bonding, acid-base chemistry and optical properties.
Liu W, Heinze K.
Dalton Trans. 2010 Oct 28;39(40):9554-64. Epub 2010 Aug 31.PMID: 20820607 [PubMed - in process]Related citations
Chemical Synthesis of Fully Biomass-Based Poly(butylene succinate) from Inedible-Biomass-Based Furfural and Evaluation of Its Biomass Carbon Ratio.
Tachibana Y, Masuda T, Funabashi M, Kunioka M.
Biomacromolecules. 2010 Sep 3. [Epub ahead of print]PMID: 20815381 [PubMed - as supplied by publisher]Related citations
Rhenium-catalyzed diastereoselective synthesis of aminoindanes via the insertion of allenes into a C-H bond.
Kuninobu Y, Yu P, Takai K.
Org Lett. 2010 Oct 1;12(19):4274-6.PMID: 20804169 [PubMed - in process]Related citations
Slow magnetic relaxation and charge-transfer in cyano-bridged coordination clusters incorporating [Re(CN)(7)](3-/4-).
Zadrozny JM, Freedman DE, Jenkins DM, Harris TD, Iavarone AT, Mathonière C, Clérac R, Long JR.
Inorg Chem. 2010 Oct 4;49(19):8886-96.PMID: 20804139 [PubMed - in process]Related citations
Molecules containing rare-earth atoms solely bonded by transition metals.
Butovskii MV, Döring C, Bezugly V, Wagner FR, Grin Y, Kempe R.
Nat Chem. 2010 Sep;2(9):741-4. Epub 2010 Jun 27.PMID: 20729893 [PubMed - indexed for MEDLINE]Related citations
N-heterocyclic carbene embedded in an N-confused porphyrin framework.
Toganoh M, Hihara T, Furuta H.
Inorg Chem. 2010 Sep 20;49(18):8182-4.PMID: 20726565 [PubMed - in process]Related citations
Probing surface sites of TiO2: reactions with [HRe(CO)5] and [CH3Re(CO)5].
Lobo-Lapidus RJ, Gates BC.
Chemistry. 2010 Oct 4;16(37):11386-98.PMID: 20726017 [PubMed - in process]Related citations
Differences between the macroscopic and tracer level chemistry of rhenium and technetium: contrasting cage isomerisation behaviour of Re(I) and Tc(I) carborane complexes.
Armstrong AF, Valliant JF.
Dalton Trans. 2010 Sep 21;39(35):8128-31. Epub 2010 Aug 9.PMID: 20694253 [PubMed - in process]Related citations
CO releasing properties and cytoprotective effect of cis-trans-[Re(II)(CO)2Br2L2]n complexes.
Zobi F, Degonda A, Schaub MC, Bogdanova AY.
Inorg Chem. 2010 Aug 16;49(16):7313-22.PMID: 20690741 [PubMed - in process]Related citations
Tailoring nanostructured, graded, and particle-reinforced Al laminates by accumulative roll bonding.
Göken M, Höppel HW.
Adv Mater. 2011 Jun 17;23(22-23):2663-8.
PMID:
21823248
[PubMed - in process]
Highly monodisperse core-shell particles created by solid-state reactions.
Radmilovic V, Ophus C, Marquis EA, Rossell MD, Tolley A, Gautam A, Asta M, Dahmen U.
Nat Mater. 2011 Aug 7. doi: 10.1038/nmat3077. [Epub ahead of print]
PMID:
21822262
[PubMed - as supplied by publisher]
Aerosol Deposition of Hydroxyapatite and 4-Hexylresorcinol Coatings on Titanium Alloys for Dental Implants.
Kim SG, Hahn BD, Park DS, Lee YC, Choi EJ, Chae WS, Baek DH, Choi JY.
J Oral Maxillofac Surg. 2011 Aug 6. [Epub ahead of print]
PMID:
21821331
[PubMed - as supplied by publisher]
Progress in the Removal of Di-[2-Ethylhexyl]-Phthalate as Plasticizer in Blood Bags.
Simmchen J, Ventura R, Segura J.
Transfus Med Rev. 2011 Aug 4. [Epub ahead of print]
PMID:
21820855
[PubMed - as supplied by publisher]
Antibacterial effect of silver-platinum coating for orthodontic appliances.
Ryu HS, Bae IH, Lee KG, Hwang HS, Lee KH, Koh JT, Cho JH.
Angle Orthod. 2011 Aug 2. [Epub ahead of print]
PMID:
21810004
[PubMed - as supplied by publisher]
Influence of metal alloy and the profile of coronary stents in patients with multivessel coronary disease.
Abreu Filho LM, Forte AA, Sumita MK, Favarato D, Meireles GC.
Clinics (Sao Paulo). 2011;66(6):985-9.
PMID:
21808863
[PubMed - in process]
A combined arc-melting and tilt-casting furnace for the manufacture of high-purity bulk metallic glass materials.
Soinila E, Pihlajama¨ki T, Bossuyt S, Ha¨nninen H.
Rev Sci Instrum. 2011 Jul;82(7):073901.
PMID:
21806193
[PubMed - as supplied by publisher]
Waste-recycling Monte Carlo with optimal estimates: Application to free energy calculations in alloys.
Adjanor G, Athe`nes M, Rodgers JM.
J Chem Phys. 2011 Jul 28;135(4):044127.
PMID:
21806110
[PubMed - as supplied by publisher]
Role of electronic excitation in the amorphization of ge-sb-te alloys.
Li XB, Liu XQ, Liu X, Han D, Zhang Z, Han XD, Sun HB, Zhang SB.
Phys Rev Lett. 2011 Jul 1;107(1):015501. Epub 2011 Jun 29.
PMID:
21797549
[PubMed - in process]
Prediction of the operating point of dendrites growing under coupled thermosolutal control at high growth velocity.
Mullis AM.
Phys Rev E Stat Nonlin Soft Matter Phys. 2011 Jun;83(6-1):061601. Epub 2011 Jun 2.
PMID:
21797374
[PubMed - as supplied by publisher]
Metal Anion-Alkyl Ammonium Complexes as Direct Write Precursors to Produce Nanopatterns of Metals, Nitrides, Oxides, Sulfides, And Alloys.
Radha B, Kiruthika S, Kulkarni GU.
J Am Chem Soc. 2011 Jul 26. [Epub ahead of print]
PMID:
21790160
[PubMed - as supplied by publisher]
Characteristics of InGaN-based concentrator solar cells operating under 150X solar concentration.
Yang CC, Jang CH, Sheu JK, Lee ML, Tu SJ, Huang FW, Yeh YH, Lai WC.
Opt Express. 2011 Jul 4;19 Suppl 4:A695-700. doi: 10.1364/OE.19.00A695.
PMID:
21747536
[PubMed - in process]
Determination of the magnetic ground state in the martensite phase of Ni-Mn-Z (Z = In, Sn and Sb) off-stoichiometric Heusler alloys by nonlinear AC susceptibility.
Umetsu RY, Fujita A, Ito W, Kanomata T, Kainuma R.
J Phys Condens Matter. 2011 Aug 17;23(32):326001. Epub 2011 Jul 25.
PMID:
21785185
[PubMed - in process]
Effects of phase constitution on magnetic susceptibility and mechanical properties of Zr-rich Zr-Mo alloys.
Suyalatu, Kondo R, Tsutsumi Y, Doi H, Nomura N, Hanawa T.
Acta Biomater. 2011 Jul 19. [Epub ahead of print]
PMID:
21784180
[PubMed - as supplied by publisher]
Bioactive glass microspheres as osteopromotive inlays in macrotextured surfaces of Ti and CoCr alloy bone implants: Trapezoidal surface grooves without inlay most efficient in resisting torsional forces.
Keränen P, Moritz N, Alm JJ, Ylänen H, Kommonen B, Aro HT.
J Mech Behav Biomed Mater. 2011 Oct;4(7):1483-91. Epub 2011 May 30.
PMID:
21783158
[PubMed - in process]
Effect of the combination of dithiooctanoate monomers and acidic adhesive monomers on adhesion to precious metals, precious metal alloys and non-precious metal alloys.
Ikemura K, Kojima K, Endo T, Kadoma Y.
Dent Mater J. 2011 Jul 28;30(4):469-77. Epub 2011 Jul 21.
PMID:
21778614
[PubMed - in process]
Nanoporous PtAg and PtCu alloys with hollow ligaments for enhanced electrocatalysis and glucose biosensing.
Xu C, Liu Y, Su F, Liu A, Qiu H.
Biosens Bioelectron. 2011 Sep 15;27(1):160-6. Epub 2011 Jul 7.
PMID:
21778046
[PubMed - in process]
Pt/Cr and Pt/Ni catalysts for oxygen reduction reaction: to alloy or not to alloy?
Escaño MC, Gyenge E, Nakanishi H, Kasai H.
J Nanosci Nanotechnol. 2011 Apr;11(4):2944-51.
PMID:
21776658
[PubMed - in process]
In vitro evaluation of the electrochemical behaviour of stainless steel and Ni-Ti orthodontic archwires at different temperatures.
Pakshir M, Bagheri T, Kazemi MR.
Eur J Orthod. 2011 Jul 19. [Epub ahead of print]
PMID:
21771804
[PubMed - as supplied by publisher]
Multifrequency atomic force microscopy: compositional imaging with electrostatic force measurements.
Magonov S, Alexander J.
Microsc Microanal. 2011 Aug;17(4):587-97. Epub 2011 Jul 19.
PMID:
21771386
[PubMed - in process]
Magnetic resonance imaging evaluation of intervertebral test spacers: an experimental comparison of magnesium versus titanium and carbon fiber reinforced polymers as biomaterials.
Ernstberger T, Buchhorn G, Heidrich G.
Ir J Med Sci. 2009 Aug 20. [Epub ahead of print]
PMID: 19693644 [PubMed - as supplied by publisher]
Ultrasonic irradiation and its application for improving the corrosion resistance of phosphate coatings on aluminum alloys.
Sheng M, Wang C, Zhong Q, Wei Y, Wang Y.
Ultrason Sonochem. 2010 Jan;17(1):21-5. Epub 2009 Aug 6.
PMID: 19692286 [PubMed - in process]
Plasma reduction of bronze corrosion developed under long-term artificial ageing.
Novakovic J, Papadopoulou O, Vassiliou P, Filippaki E, Bassiakos Y.
Anal Bioanal Chem. 2009 Aug 15. [Epub ahead of print]
PMID: 19685234 [PubMed - as supplied by publisher]
First-principles studies on alloying and simplified thermodynamic aqueous chemical stability of calcium-, zinc-, aluminum-, yttrium- and iron-doped magnesium alloys.
Velikokhatnyi OI, Kumta PN.
Acta Biomater. 2009 Aug 14. [Epub ahead of print]
PMID: 19683600 [PubMed - as supplied by publisher]
American Elements is a copyrighted U.S. Trademark. All rights reserved.
Molybdenum is a Block D, Group 6, Period 5 element. The number of electrons in each of Molybdenum's shells is 2, 8, 18, 13, 1 and its electronic configuration is [Kr] 4d5 5s1. In its elemental form molybdenum's CAS number is 7439-98-7. The molybdenum atom has a radius of 136.3.pm and it's Van der Waals radius is 200.pm. Molybdenum is toxic unless it is in small quantities. Molybdenum has the third highest melting point of any element, exceeded only by tungsten and tantalum. Molybdenum is a catalyst in the oil refining. It has many other applications, including in catalysts, pigments, corrosion inhibitors and lubricants. It has 
a very high elastic modulus. Molybdenum is available
as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity); metals in the form of foil, sputtering target, and rod, and compounds as submicron and nanopowder. It is used in steel alloys to add hardness and raise melting points. It is a component in Hastelloys brand steel. Molybdenum is used in nuclear reactors and aerospace components. Molybdenum was first discovered by Carl Wilhelm in 1778. The origin of the name Molybdenum comes from the Greek word molubdos meaning lead. See Molybdenum research below. 
Rhenium is a Block D, Group 7, Period 6 element. The number of electrons in each of Rhodium's shells is 2, 8, 18, 32, 13, 2 and its electronic configuration is [Xe] 4f14 5d5 6s2. In its 
elemental form rhenium's CAS number is 7440-15-5. The rhenium atom has a radius of 137.1.pm and it's Van der Waals radius is 200.pm. The toxicity of Rhenium has not yet been established . Rhenium is the fourth densestelementexceeded only by that of platinum, iridium, and osmium . It has the second highest melting point exceeded only by tungsten and carbon . Rhenium is available as metal and 
compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity); metals in the form of foil, sputtering target, and rod, and compounds as submicron and nanopowder. Because of this, thermocouples made of Tungsten/Rhenium alloy is are used when temperatures will rise to 2000 C and rhenium wire is used in photoflash lamps for photography. It is widely used as filaments for mass spectrographs and ion gauges. Rhenium was first discovered by Walter Noddack in 1925 in the Rhine region of Germany. The name Rhenium originates from the Latin word 'Rhenus' meaning "Rhine" after the place of discovery. See Rhenium research below.
