ChemiPlus Logo

Dictionary - Training

Molybdenum

42
Mo
95.94
Molybdenum
 General | States | Energies | Oxidation & Electrons | Appearance & Characteristics | Reactions | Other Forms Radius | Conductivity | Abundance

General:

Name: Molybdenum Symbol: Mo
Group: Trans. Met. Atomic weight: 95.94
Density @ 293 K: 10.2 g/cm3 Atomic volume: 9.4 cm3/mol
Group: Trans. Met. discovered: 1781

States:

state (s, l, g): s
melting point: 2890.2 K boiling point: 4923 K
Heat of fusion: 32.0 kJ/mol Heat of vaporization: 598.0 kJ/mol

Energies:

1st ionization energy: 684.9 kJ/mole
electronegativity: 2.24 2nd ionization energy: 1588.2 kJ/mole
electron affinity: 72 kJ/mole 3rd ionization energy: 2620.5 kJ/mole
Specific heat: 0.25 J/gK heat atomization: 658 kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,18,13,1 electron configuration: [Kr] 4d5 5s1
minimum oxidation number: -2 maximum oxidation number: 6
min. common oxidation no.: 0 max. common oxidation no.: 6

Appearance & Characteristics:

structure: bcc: body-centered cubic color: silvery-white
uses: catalysts, tool steel toxicity:
hardness: mohs characteristics: very hard

Reactions:

reaction with air: none, w/ht =>MoO3
reaction with 6M HCl: none reaction with 6M HCl: none
reaction with 15M HNO3: reaction with 6M NaOH:

Other Forms:

number of isotopes: 7 hydride(s): none
oxide(s): MoO2 MoO3 chloride(s): MoClx [x=2-6]

Radius:

ionic radius (2- ion): pm ionic radius (1- ion): pm
atomic radius: 139 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): pm ionic radius (3+ ion): 83 pm

Conductivity:

thermal conductivity: 138 J/m-sec-deg
electrical conductivity: 192.308 1/mohm-cm polarizability: 12.8 A^3

Abundance:

source: Molybdenite (sulfide)
rel. abund. solar system: 0.407 log abundance earth's crust: 0.2 log
cost, pure: 11 $/100g cost, bulk: $/100g