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Molybdenum, 42Mo |
| Molybdenum |
|---|
| Pronunciation | (mə-LIB-din-əm) |
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| Appearance | gray metallic |
|---|
| Standard atomic weight Ar, std(Mo) | 7001959500000000000♠95.95(1)[1] |
|---|
| Molybdenum in the periodic cairt |
|---|
|
|
| Atomic nummer (Z) | 42 |
|---|
| Group | group 6 |
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| Period | period 5 |
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| Block | d-block |
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| Element category | Transeetion metal |
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| Electron confeeguration | [Kr] 4d5 5s1 |
|---|
| Electrons per shell | 2, 8, 18, 13, 1 |
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| Pheesical properties |
|---|
| Phase at STP | solit |
|---|
| Meltin pynt | 2896 K (2623 °C, 4753 °F) |
|---|
| Bylin pynt | 4912 K (4639 °C, 8382 °F) |
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| Density (near r.t.) | 10.28 g/cm3 |
|---|
| when liquid (at m.p.) | 9.33 g/cm3 |
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| Heat o fusion | 37.48 kJ/mol |
|---|
| Heat o vapourisation | 598 kJ/mol |
|---|
| Molar heat capacity | 24.06 J/(mol·K) |
|---|
Vapour pressur
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
| at T (K)
|
2742
|
2994
|
3312
|
3707
|
4212
|
4879
|
|
| Atomic properties |
|---|
| Oxidation states | −4, −2, −1, 0, +1,[2] +2, +3, +4, +5, +6 strangly acidic |
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| Electronegativity | Pauling scale: 2.16 |
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| Atomic radius | empirical: 139 pm |
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| Covalent radius | 154±5 pm |
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 Colour lines in a spectral rangeSpectral lines o molybdenum |
| Ither properties |
|---|
| Naitural occurrence | primordial |
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| Creestal structur | body-centred cubic (bcc) |
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| Speed o soond thin rod | 5400 m/s (at r.t.) |
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| Thermal expansion | 4.8 µm/(m·K) (at 25 °C) |
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| Thermal conductivity | 138 W/(m·K) |
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| Thermal diffusivity | 54.3[3] mm2/s (at 300 K) |
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| Electrical resistivity | 53.4 n Ω·m (at 20 °C) |
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| Magnetic orderin | paramagnetic[4] |
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| Young's modulus | 329 GPa |
|---|
| Shear modulus | 126 GPa |
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| Bulk modulus | 230 GPa |
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| Poisson ratio | 0.31 |
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| Mohs haurdness | 5.5 |
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| Vickers haurdness | 1530 MPa |
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| Brinell haurdness | 1500 MPa |
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| CAS Nummer | 7439-98-7 |
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| History |
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| Diskivery | Carl Wilhelm Scheele (1778) |
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| First isolation | Peter Jacob Hjelm (1781) |
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| Main isotopes o molybdenum |
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|
|
| Decay modes in parentheses is predict, but hisna yet been observed |
| | references |
| style="text-align:left"|
|
|
|
in
|
calc from C
|
diff
|
report
|
ref
|
| C
|
2623
|
—
|
—
|
|
|
| K
|
2896
|
2896
|
0
|
|
|
| F
|
4753
|
4753
|
0
|
|
|
| WD
|
4752 !4752 Fahrenheit 
|
|
|
|
| input
|
C: 2623, K: 2896, F: 4753
|
| comment
|
|
| style="text-align:left"|
|
|
|
in
|
calc from C
|
diff
|
report
|
ref
|
| C
|
4639
|
—
|
—
|
|
|
| K
|
4912
|
4912
|
0
|
|
|
| F
|
8382
|
8382
|
0
|
|
|
| WD
|
8717 !8717 Fahrenheit
|
|
|
|
| input
|
C: 4639, K: 4912, F: 8382
|
| comment
|
|
References
Thir references will appear in the airticle, but this list appears anerly on this page.
- ↑ Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
- ↑ "Molybdenum: molybdenum(I) fluoride compound data". OpenMOPAC.net. Retrieved 10 December 2007.
- ↑ A. Lindemann, J. Blumm (2009). Measurement of the Thermophysical Properties of Pure Molybdenum. 17th Plansee Seminar. 3.
- ↑ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.
- ↑ "Molybdenum: molybdenum(I) fluoride compound data". OpenMOPAC.net. Retrieved 10 December 2007.
