Revision as of 00:27, 16 December 2020 by imported>Monkbot
[[Category:Template:Pagetype with short description]]
Molybdenum, 42Mo |
| Molybdenum |
|---|
| Pronunciation | (Template:Respell) |
|---|
| Appearance | gray metallic |
|---|
| Standard atomic weight Ar, std(Mo) | Template:Val[1] |
|---|
| Molybdenum in the periodic table |
|---|
|
|
| Atomic number (Z) | 42 |
|---|
| Group | group 6 |
|---|
| Period | period 5 |
|---|
| Block | d-block |
|---|
| Electron configuration | [Kr] 4d5 5s1 |
|---|
| Electrons per shell | 2, 8, 18, 13, 1 |
|---|
| Physical properties |
|---|
| Phase at STP | solid |
|---|
| Melting point | 2896 K (2623 °C, 4753 °F) |
|---|
| Boiling point | 4912 K (4639 °C, 8382 °F) |
|---|
| Density (near r.t.) | 10.28 g/cm3 |
|---|
| when liquid (at m.p.) | 9.33 g/cm3 |
|---|
| Heat of fusion | 37.48 kJ/mol |
|---|
| Heat of vaporization | 598 kJ/mol |
|---|
| Molar heat capacity | 24.06 J/(mol·K) |
|---|
Vapor pressure
| 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 (a strongly acidic oxide) |
|---|
| Electronegativity | Pauling scale: 2.16 |
|---|
| Ionization energies | - 1st: 684.3 kJ/mol
- 2nd: 1560 kJ/mol
- 3rd: 2618 kJ/mol
-
|
|---|
| Atomic radius | empirical: 139 pm |
|---|
| Covalent radius | 154±5 pm |
|---|
| Spectral lines of molybdenum |
| Other properties |
|---|
| Natural occurrence | primordial |
|---|
| Crystal structure | body-centered cubic (bcc) |
|---|
| Speed of sound thin rod | 5400 m/s (at r.t.) |
|---|
| Thermal expansion | 4.8 µm/(m·K) (at 25 °C) |
|---|
| Thermal conductivity | 138 W/(m·K) |
|---|
| Thermal diffusivity | 54.3 mm2/s (at 300 K)[3] |
|---|
| Electrical resistivity | 53.4 nΩ·m (at 20 °C) |
|---|
| Magnetic ordering | paramagnetic[4] |
|---|
| Magnetic susceptibility | +89.0·10−6 cm3/mol (298 K)[5] |
|---|
| Young's modulus | 329 GPa |
|---|
| Shear modulus | 126 GPa |
|---|
| Bulk modulus | 230 GPa |
|---|
| Poisson ratio | 0.31 |
|---|
| Mohs hardness | 5.5 |
|---|
| Vickers hardness | 1400–2740 MPa |
|---|
| Brinell hardness | 1370–2500 MPa |
|---|
| CAS Number | 7439-98-7 |
|---|
| History |
|---|
| Discovery | Carl Wilhelm Scheele (1778) |
|---|
| First isolation | Peter Jacob Hjelm (1781) |
|---|
| Main isotopes of molybdenum |
|---|
|
|
Category: Molybdenum | references |
[[Category:Infobox templates|Template:Remove first word]]
References
These references will appear in the article, but this list appears only on this page.
Lua error: Internal error: The interpreter has terminated with signal "24".