Molybdenum - Revision history

MDerrick at 15:53, 14 December 2025

2025-12-14T15:53:46Z

MDerrick at 17:18, 23 August 2022

2022-08-23T17:18:08Z

← Older revision		Revision as of 13:18, 23 August 2022
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	[[File:Wulfeniteemr1.jpg\|thumb\|Wulfenite]]		[[File:Wulfeniteemr1.jpg\|thumb\|Wulfenite]]
	== Description ==		== Description ==
			[[File:pw20608wulfenite.jpg\|thumb\|Wulfenite]]
	A silvery-white metallic element. Molybdenum occurs in the earth's crust in concentrations of 1-1.5 ppm. It is obtained from molybdenite and wulfenite ores and also as a by-product of [[copper]] production. Molybdenum was first discovered by Carl William Scheele in 1778 and isolated by Peter Hjelm in 1782. Molybdenum is very resistant to corrosion, has high electrical conductivity and can withstand high temperatures. Metallic molybdenum is used in the manufacture of hardened steels, tools, boiler plate, rifle barrels, propeller shafts, x-ray tubes, electrical contacts, filaments, and glass-to-metal seals.		A silvery-white metallic element. Molybdenum occurs in the earth's crust in concentrations of 1-1.5 ppm. It is obtained from molybdenite and wulfenite ores and also as a by-product of [[copper]] production. Molybdenum was first discovered by Carl William Scheele in 1778 and isolated by Peter Hjelm in 1782. Molybdenum is very resistant to corrosion, has high electrical conductivity and can withstand high temperatures. Metallic molybdenum is used in the manufacture of hardened steels, tools, boiler plate, rifle barrels, propeller shafts, x-ray tubes, electrical contacts, filaments, and glass-to-metal seals.

	~~[[File:pw20608wulfenite.jpg\|thumb\|Wulfenite]]~~

	== Synonyms and Related Terms ==		== Synonyms and Related Terms ==
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	[[[SliderGallery rightalign\|Wulfeniteitaly1.jpg~Raman]]]		[[[SliderGallery rightalign\|Wulfeniteitaly1.jpg~Raman]]]

	== Risks ==		== Risks ==

MDerrick at 17:17, 23 August 2022

2022-08-23T17:17:44Z

← Older revision		Revision as of 13:17, 23 August 2022
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	[[[SliderGallery rightalign\|Wulfeniteitaly1.jpg~Raman]]]		[[[SliderGallery rightalign\|Wulfeniteitaly1.jpg~Raman]]]

	== ~~Other Properties~~ ==		== Risks ==

	Flame color is green-yellow. Insoluble in water, dilute hydrochloric acid and alkalis. Reacts with nitric acid and sulfuric acid.		* Highly toxic.
			* Rembar: [https://www.rembar.com/wp-content/uploads/2019/12/SDS-Molybdenum-002.pdf SDS solid metal]
			* MerckMillipore: [https://www.emdmillipore.com/US/en/product/msds/MDA_CHEM-112254?ReferrerURL=https%3A%2F%2Fsearch.yahoo.com%2F&bd=1 SDS powder]

			==Physical and Chemical Properties==

			* Flame color is green-yellow.
			* Insoluble in water, dilute hydrochloric acid and alkalis.
			* Reacts with nitric acid and sulfuric acid.

	{\| class="wikitable"		{\| class="wikitable"
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	\|-		\|-
	! scope="row"\| Melting Point		! scope="row"\| Melting Point
	\| 2622		\| 2622 C
	\|-		\|-
	! scope="row"\| Density		! scope="row"\| Density
	\| 10.28		\| 10.28 g/ml
	\|-		\|-
	! scope="row"\| Molecular Weight		! scope="row"\| Molecular Weight
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	\|-		\|-
	! scope="row"\| Boiling Point		! scope="row"\| Boiling Point
	\| 4639		\| 4639 C
	\|}		\|}

	== ~~Hazards~~ and ~~Safety ==~~		==Resources and Citations==

	~~Highly toxic.~~

	~~Mallinckrodt Baker: [http://www.jtbaker.com/msds/englishhtml/m7810.htm MSDS]~~

	~~== Additional Information ==~~

	~~Web Elements: [http://www.webelements.com/webelements/elements/text/Mo/key.html Website]~~

	~~== Sources Checked for Data in Record~~ ==

	* ''Chemical & Engineering News'', American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003 Comment: Philip Mitchell, p. 108; states discovered by Scheele in 1778		* ''Chemical & Engineering News'', American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003 Comment: Philip Mitchell, p. 108; states discovered by Scheele in 1778
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	* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998		* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998

	* Wikipedia~~, the free encyclopedia, at http://www.wikipedia.com Comment~~: http://en.wikipedia.org/wiki/Molybdenum (Accessed Sept. 10, 2005)		* Wikipedia: http://en.wikipedia.org/wiki/Molybdenum (Accessed Sept. 10, 2005)

	* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 516		* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 516

	* ~~Website address 1 Comment:~~ Web Elements at http://www.webelements.com/webelements/elements/text/Mo/key.html states discovered by Scheele in 1782		* Web Elements at http://www.webelements.com/webelements/elements/text/Mo/key.html states discovered by Scheele in 1782



	[[Category:Materials database]]		[[Category:Materials database]]

Jruggiero: Text replace - "== Authority (list of all sources checked for information on this subject)==" to "== Sources Checked for Data in Record =="

2016-04-29T16:47:26Z

Text replace - "== Authority (list of all sources checked for information on this subject)==" to "== Sources Checked for Data in Record =="

← Older revision		Revision as of 12:47, 29 April 2016
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	Web Elements: [http://www.webelements.com/webelements/elements/text/Mo/key.html Website]		Web Elements: [http://www.webelements.com/webelements/elements/text/Mo/key.html Website]

	== ~~Authority (list of all sources checked~~ for ~~information on this subject)~~==		== Sources Checked for Data in Record ==

	* ''Chemical & Engineering News'', American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003 Comment: Philip Mitchell, p. 108; states discovered by Scheele in 1778		* ''Chemical & Engineering News'', American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003 Comment: Philip Mitchell, p. 108; states discovered by Scheele in 1778

MDerrick: /* Description */

2015-10-30T14:53:12Z

Description

← Older revision		Revision as of 10:53, 30 October 2015
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	== Description ==		== Description ==

	A silvery-white metallic element. Molybdenum occurs in the earth's crust in concentrations of 1-1.5 ppm. It is obtained from molybdenite and wulfenite ores and also as a by-product of [~~http://cameo.mfa.org/materials/fullrecord.asp?name=copper~~ copper] production. Molybdenum was first discovered by Carl William Scheele in 1778 and isolated by Peter Hjelm in 1782. Molybdenum is very resistant to corrosion, has high electrical conductivity and can withstand high temperatures. Metallic molybdenum is used in the manufacture of hardened steels, tools, boiler plate, rifle barrels, propeller shafts, x-ray tubes, electrical contacts, filaments, and glass-to-metal seals.		A silvery-white metallic element. Molybdenum occurs in the earth's crust in concentrations of 1-1.5 ppm. It is obtained from molybdenite and wulfenite ores and also as a by-product of [[copper]] production. Molybdenum was first discovered by Carl William Scheele in 1778 and isolated by Peter Hjelm in 1782. Molybdenum is very resistant to corrosion, has high electrical conductivity and can withstand high temperatures. Metallic molybdenum is used in the manufacture of hardened steels, tools, boiler plate, rifle barrels, propeller shafts, x-ray tubes, electrical contacts, filaments, and glass-to-metal seals.

	[[File:pw20608wulfenite.jpg\|thumb\|Wulfenite]]		[[File:pw20608wulfenite.jpg\|thumb\|Wulfenite]]

	== Synonyms and Related Terms ==		== Synonyms and Related Terms ==

MDerrick: /* Authority */

2015-10-30T14:52:45Z

Authority

← Older revision		Revision as of 10:52, 30 October 2015
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	Web Elements: [http://www.webelements.com/webelements/elements/text/Mo/key.html Website]		Web Elements: [http://www.webelements.com/webelements/elements/text/Mo/key.html Website]

	== Authority ==		== Authority (list of all sources checked for information on this subject)==

	* ''Chemical & Engineering News'', American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003 Comment: Philip Mitchell, p. 108; states discovered by Scheele in 1778		* ''Chemical & Engineering News'', American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003 Comment: Philip Mitchell, p. 108; states discovered by Scheele in 1778

Unknown user at 12:38, 24 July 2013

2013-07-24T12:38:55Z

Unknown user at 18:16, 27 April 2013

2013-04-27T18:16:38Z

New page

[[File:Wulfeniteemr1.jpg|thumb|Wulfenite]]
== Description ==

A silvery-white metallic element. Molybdenum occurs in the earth's crust in concentrations of 1-1.5 ppm. It is obtained from molybdenite and wulfenite ores and also as a by-product of [http://cameo.mfa.org/materials/fullrecord.asp?name=copper copper] production. Molybdenum was first discovered by Carl William Scheele in 1778 and isolated by Peter Hjelm in 1782. Molybdenum is very resistant to corrosion, has high electrical conductivity and can withstand high temperatures. Metallic molybdenum is used in the manufacture of hardened steels, tools, boiler plate, rifle barrels, propeller shafts, x-ray tubes, electrical contacts, filaments, and glass-to-metal seals.

[[File:pw20608wulfenite.jpg|thumb|Wulfenite]]
== Synonyms and Related Terms ==

Mo; Molybdeen (Ned.); molybdne (Fr.); Molybdn (Deut.); molibdeno (It., Esp.); molibdnio (Port.); molybden (Sven.); molybdos (Gr.); molybdenite; wulfenite

[[[SliderGallery rightalign|Wulfeniteitaly1.jpg~Raman]]]

== Other Properties ==

Flame color is green-yellow. Insoluble in water, dilute hydrochloric acid and alkalis. Reacts with nitric acid and sulfuric acid.

{| class="wikitable"
|-
! scope="row"| Composition
| Mo (atomic no. 42)
|-
! scope="row"| CAS
| 7439-98-7
|-
! scope="row"| Mohs Hardness
| 5.5
|-
! scope="row"| Melting Point
| 2622
|-
! scope="row"| Density
| 10.28
|-
! scope="row"| Molecular Weight
| atomic wt = 95.94
|-
! scope="row"| Boiling Point
| 4639
|}

== Hazards and Safety ==

Highly toxic.

Mallinckrodt Baker: [http://www.jtbaker.com/msds/englishhtml/m7810.htm MSDS]

== Additional Information ==

Web Elements: [http://www.webelements.com/webelements/elements/text/Mo/key.html Website]

== Authority ==

* ''Chemical & Engineering News'', American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003 Comment: Philip Mitchell, p. 108; states discovered by Scheele in 1778

* Richard S. Lewis, Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993

* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976

* Random House, Random House, ''Webster's Encyclopedic Unabridged Dictionary of the English Language'', Grammercy Book, New York, 1997

* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 6317; discovered by Scheele in 1778 and isolated by Hjelm in 1782

* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998

* Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Molybdenum (Accessed Sept. 10, 2005)

* G.S.Brady, G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 516

* Website address 1, Website address 1 Comment: Web Elements at http://www.webelements.com/webelements/elements/text/Mo/key.html states discovered by Scheele in 1782

[[Category:Materials database]]

← Older revision		Revision as of 11:53, 14 December 2025
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	== Synonyms and Related Terms ==		== Synonyms and Related Terms ==

	Mo; Molybdeen (Ned.); molybdène (Fr.); Molybdän (Deut.); molibdeno (It., Esp.); molibdénio (Port.); molybden (Sven.); molybdos (Gr.); molybdenite; ~~wulfenite~~		Mo; Molybdeen (Ned.); molybdène (Fr.); Molybdän (Deut.); molibdeno (It., Esp.); molibdénio (Port.); molybden (Sven.); molybdos (Gr.); molybdenite; wulfenite; molly (moly)

	[[[SliderGallery rightalign\|Wulfeniteitaly1.jpg~Raman]]]		[[[SliderGallery rightalign\|Wulfeniteitaly1.jpg~Raman]]]
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	* ''Chemical & Engineering News'', American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003 Comment: Philip Mitchell, p. 108; states discovered by Scheele in 1778		* ''Chemical & Engineering News'', American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003 Comment: Philip Mitchell, p. 108; states discovered by Scheele in 1778

	* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993		* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993

	* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976		* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976

	* Random House, ''Webster's Encyclopedic Unabridged Dictionary of the English Language'', Grammercy Book, New York, 1997		* Random House, ''Webster's Encyclopedic Unabridged Dictionary of the English Language'', Grammercy Book, New York, 1997

	* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 6317; discovered by Scheele in 1778 and isolated by Hjelm in 1782		* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 6317; discovered by Scheele in 1778 and isolated by Hjelm in 1782

	* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998		* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998
			* Wikipedia: [https://en.wikipedia.org/wiki/Molybdenum Molybdenum] (Accessed Sept. 10, 2005 and Dec 2025)
	* Wikipedia: ~~http~~://en.wikipedia.org/wiki/Molybdenum (Accessed Sept. 10, 2005)

	* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 516		* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 516

	* Web Elements at http://www.webelements.com/webelements/elements/text/Mo/key.html states discovered by Scheele in 1782		* Web Elements at http://www.webelements.com/webelements/elements/text/Mo/key.html states discovered by Scheele in 1782

← Older revision		Revision as of 08:38, 24 July 2013
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	== Synonyms and Related Terms ==		== Synonyms and Related Terms ==

	Mo; Molybdeen (Ned.); ~~molybdne~~ (Fr.); ~~Molybdn~~ (Deut.); molibdeno (It., Esp.); ~~molibdnio~~ (Port.); molybden (Sven.); molybdos (Gr.); molybdenite; ~~wulfenite~~		Mo; Molybdeen (Ned.); molybdène (Fr.); Molybdän (Deut.); molibdeno (It., Esp.); molibdénio (Port.); molybden (Sven.); molybdos (Gr.); molybdenite; wulfenite

	[[[SliderGallery rightalign\|Wulfeniteitaly1.jpg~Raman]]]		[[[SliderGallery rightalign\|Wulfeniteitaly1.jpg~Raman]]]
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	* ''Chemical & Engineering News'', American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003 Comment: Philip Mitchell, p. 108; states discovered by Scheele in 1778		* ''Chemical & Engineering News'', American Chemical Society, Washington DC, 81 (36) , Sept. 8, 2003 Comment: Philip Mitchell, p. 108; states discovered by Scheele in 1778

	* ~~Richard S. Lewis,~~ Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993		* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993

	* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976		* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976

	* ~~Random House,~~ Random House, ''Webster's Encyclopedic Unabridged Dictionary of the English Language'', Grammercy Book, New York, 1997		* Random House, ''Webster's Encyclopedic Unabridged Dictionary of the English Language'', Grammercy Book, New York, 1997

	* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 6317; discovered by Scheele in 1778 and isolated by Hjelm in 1782		* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 6317; discovered by Scheele in 1778 and isolated by Hjelm in 1782
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	* Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Molybdenum (Accessed Sept. 10, 2005)		* Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Molybdenum (Accessed Sept. 10, 2005)

	* ~~G.S.Brady,~~ G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 516		* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 516

	* ~~Website address 1,~~ Website address 1 Comment: Web Elements at http://www.webelements.com/webelements/elements/text/Mo/key.html states discovered by Scheele in 1782		* Website address 1 Comment: Web Elements at http://www.webelements.com/webelements/elements/text/Mo/key.html states discovered by Scheele in 1782



	[[Category:Materials database]]		[[Category:Materials database]]