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[[Category:Template:Pagetype with short description]]
Palladium, 46Pd |
| Palladium |
|---|
| Pronunciation | (Template:Respell) |
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| Appearance | silvery white |
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| Standard atomic weight Ar, std(Pd) | Template:Val[1] |
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| Palladium in the periodic table |
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|
|
| Atomic number (Z) | 46 |
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| Group | group 10 |
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| Period | period 5 |
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| Block | d-block |
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| Electron configuration | [Kr] 4d10 |
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| Electrons per shell | 2, 8, 18, 18 |
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| Physical properties |
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| Phase at STP | solid |
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| Melting point | 1828.05 K (1554.9 °C, 2830.82 °F) |
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| Boiling point | 3236 K (2963 °C, 5365 °F) |
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| Density (near r.t.) | 12.023 g/cm3 |
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| when liquid (at m.p.) | 10.38 g/cm3 |
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| Heat of fusion | 16.74 kJ/mol |
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| Heat of vaporization | 358 kJ/mol |
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| Molar heat capacity | 25.98 J/(mol·K) |
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Vapor pressure
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
| at T (K)
|
1721
|
1897
|
2117
|
2395
|
2753
|
3234
|
|
| Atomic properties |
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| Oxidation states | 0, +1, +2, +3, +4 (a mildly basic oxide) |
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| Electronegativity | Pauling scale: 2.20 |
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| Ionization energies | - 1st: 804.4 kJ/mol
- 2nd: 1870 kJ/mol
- 3rd: 3177 kJ/mol
-
|
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| Atomic radius | empirical: 137 pm |
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| Covalent radius | 139±6 pm |
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| Van der Waals radius | 163 pm |
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| Spectral lines of palladium |
| Other properties |
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| Natural occurrence | primordial |
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| Crystal structure | face-centered cubic (fcc) |
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| Speed of sound thin rod | 3070 m/s (at 20 °C) |
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| Thermal expansion | 11.8 µm/(m·K) (at 25 °C) |
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| Thermal conductivity | 71.8 W/(m·K) |
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| Electrical resistivity | 105.4 nΩ·m (at 20 °C) |
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| Magnetic ordering | paramagnetic[2] |
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| Magnetic susceptibility | +567.4·10−6 cm3/mol (288 K)[3] |
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| Young's modulus | 121 GPa |
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| Shear modulus | 44 GPa |
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| Bulk modulus | 180 GPa |
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| Poisson ratio | 0.39 |
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| Mohs hardness | 4.75 |
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| Vickers hardness | 400–600 MPa |
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| Brinell hardness | 320–610 MPa |
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| CAS Number | 7440-05-3 |
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| History |
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| Naming | after asteroid Pallas, itself named after Pallas Athena |
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| Discovery and first isolation | William Hyde Wollaston (1802) |
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| Main isotopes of palladium |
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|
|
Category: Palladium | references |
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References
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