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