Element Molybdenum

Molybdenum ElementIt is an element with atomic symbol Mo, atomic number 42, and atomic weight 95.94.
Molybdenum is a transition element and is present in several human enzymes, such as xanthine and sulfite oxidases, and in enzyme cofactors in oxidative reduction reactions.
Molybdenum is found in many foods and deficiencies are rare. Molybdenum deficiency has been described in animals and rare cases have been reported in patients on total parenteral nutrition, clinical signs being mental disturbances and coma accompanied by hypouricemia and hypermethioninemia.
Molybdenum is relatively nontoxic, although high levels may be a cause of high uric acid levels and an increased incidence of gout. Liver toxicity from molybdenum has not been described.
Molybdenum atom is a chromium group element atom. It has a role as a micronutrient.

Names and Identifiers

Chemical Formula:Mo
CAS:7439-98-7
Molecular Weight:95.940 g/mol
EC Number :231-107-2
MDL Number:MFCD00003465
Color:gray metallic/ gray-white
Other Names:Molybdéne, Molibdeno
PubChem CID:23932
IUPAC Name:Molybdneum
Inchl:InChI=1S/Mo
InChI Key:ZOKXTWBITQBERF-UHFFFAOYSA-N
Canonical SMILES:[Mo]
ICSC Number:1003

Physical & Chemical Properties

Phase:Solid
Density:10.28 g/cm³
Boiling Point:4912 K ​(4639 °C, ​8382 °F)
Melting Point:2896 K ​(2623 °C, ​4753 °F)
Molecular Formula:Mo
Flash Point:-23 °C
Exact Mass:97.905411
Symbol:n/a
Signal Word:Danger
Hazard Statements:H228
Precautionary Statements:n/a
Hazard Codes:Xi:Irritant
Risk Phrases:R36/37/38
Safety Phrases:S26-S36/37/39-S16-S9-S62-S61-S36/37
RIDADR:UN 3264 8/PG 3
WGK Germany:3
RTECS:QA4680000
Packaging Group:III
Hazard Class:4.1

There are 35 known isotopes of molybdenum, ranging in atomic mass from 83 to 117, as well as four metastable nuclear isomers.
Seven isotopes occur naturally, with atomic masses of 92, 94, 95, 96, 97, 98, and 100. Of these naturally occurring isotopes, only molybdenum-100 is unstable.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
92Mo91.906809 (4)14.84 (35)0
94Mo93.9050853 (26)9.25 (12)0
95Mo94.9058411 (22)15.92 (13)5/2-0.9142
96Mo95.9046785 (22)16.68 (2)0
97Mo96.9060205 (22)9.55 (8)5/2-0.9335
98Mo97.9054073 (22)24.13 (31)0
100Mo99.907477 (6)9.63 (23)0

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
90Mo89.913945.7 hEC to 90Nb0
91Mo90.9117515.5 mEC to 91Nb9/2
93Mo92.9068113500 yEC to 93Nb5/2
99Mo98.9077112.7476 dβ to 97Tc1/20.375

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