Periodic Table of the Elements

Chemical & Physical Properties of Molybdenum

Molybdenum

Latin name	Molybdaneum
English name	Molybdenum
chemical symbol	Mo
atomic number	42
relative atomic mass	95,94
period	5
group	VI.B
classification	transition metals
discovery year	1778
discoverer	P. J. Hjelm
melting point [°C]	2617
boiling point [°C]	4612
density [g cm-3]	10,2
density at melting point [g cm-3]	9,33
electronegativity [Pauling]	2,16
oxidation states	II ˜ VI
electron configuration	[Kr]4d5 5s1
atomic radius [pm]	190
covalent radius [pm]	145
specific heat [J g-1K-1]	0,25
heat of fusion [kJ mol-1]	32,0
thermal conductivity [W m-1 K-1]	139
el. conductivity [S m-1]	1,73.107
1. ionizing potential [eV]	7,0924
2. ionizing potential [eV]	16,461
3. ionizing potential [eV]	27,16
Mohs hardness	5,5
Vickers hardness [MPa]	1530
Brinell hardness [MPa]	1500
shear modulus [GPa]	20
Young's modulus [GPa]	329
state at normal conditions	solid

Molybdenum is a silvery white, very hard metal.

Resources

• BARTHELMY, David. Mineral Species containing Molybdenum. In: Mineralogy database [online]. 2010 [cit. 2012-06-20]. Available from: http://webmineral.com/chem/Chem-Mo.shtml
• MELLOR, Joseph. Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 11. Londýn: Longmans, Green & Co., 1931.
• PERELMAN, Fanja; ZVORYKIN, Aleksandr. Molibden i volfram. Moskva: Nauka, 1968.
• POLYAK, Désirée. Molybdenum. In: U.S. GEOLOGICAL SURVEY. Mineral Commodity Summaries [online]. 2013 [cit. 2013-03-03]. Available from: http://minerals.usgs.gov/.../mcs-2013-molyb.pdf
• REMY, Heinrich. Anorganická chemie - II. díl. 2. české vydání, dotisk. Praha: SNTL, 1972, s. 185-195
• STARÝ, Jaromír; SITENSKÝ, Ivo; HODKOVÁ, Tereza. Surovinové zdroje České republiky - Nerostné suroviny 2011. In: Česká geologická služba. Surovinové zdroje v ČR [online]. 2011 [cit. 2012-07-25]. Available from: http://www.geology.cz/.../rocenka2011sur.pdf

niobium ← molybdenum → technetium

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