| colspan=2 style="text-align: center" | Main article: Isotopes of प्वलाख प्वलाख |
78Pt |
|
रुप |
grayish white |
साधारण गुण |
नां, चिं, ल्या | प्वलाख, Pt, 78 |
उच्चारण | /ˈplætɨnəm/ |
धातुया वर्ग | transition metal |
ग्रुप, पिरियद, ब्लक | 10, 6, d |
Standard atomic weight | 195.084 |
Electron configuration | [Xe] 4f14 5d9 6s1 2, 8, 18, 32, 17, 1 |
History |
Discovery | Antonio de Ulloa (1735) |
First isolation | Antonio de Ulloa (1735) |
Physical properties |
Phase | solid |
Density (near r.t.) | 21.45 g·cm−3 |
Liquid density at m.p. | 19.77 g·cm−3 |
Melting point | 2041.4 K, 1768.3 °C, 3214.9 °F |
Boiling point | 4098 K, 3825 °C, 6917 °F |
Heat of fusion | 22.17 kJ·mol−1 |
Heat of vaporization | 510 kJ·mol−1 |
Molar heat capacity | 25.86 J·mol−1·K−1 |
Vapor pressure |
P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k | at T (K) | 2330 | (2550) | 2815 | 3143 | 3556 | 4094 | |
Atomic properties |
Oxidation states | 6, 5, 4, 3, 2, 1, −1, −2 (mildly basic oxide) |
Electronegativity | 2.28 (Pauling scale) |
Ionization energies | 1st: 870 kJ·mol−1 |
2nd: 1791 kJ·mol−1 |
Atomic radius | 139 pm |
Covalent radius | 136±5 pm |
Van der Waals radius | 175 pm |
Miscellanea |
Crystal structure | face-centered cubic |
Magnetic ordering | paramagnetic |
Electrical resistivity | (20 °C) 105 nΩ·m |
Thermal conductivity | 71.6 W·m−1·K−1 |
Thermal expansion | (25 °C) 8.8 µm·m−1·K−1 |
Speed of sound (thin rod) | (r.t.) 2800 m·s−1 |
Tensile strength | 125-240 MPa |
Young's modulus | 168 GPa |
Shear modulus | 61 GPa |
Bulk modulus | 230 GPa |
Poisson ratio | 0.38 |
Mohs hardness | 4–4.5 |
Vickers hardness | 549 MPa |
Brinell hardness | 392 MPa |
CAS registry number | 7440-06-4 |
Most stable isotopes |
iso | NA | half-life | DM | DE (MeV) | DP | 190Pt | 0.014% | 6.5×1011 y | α | 3.252 | 186Os | 192Pt | 0.782% | >4.7×1016 y | (α) | 2.4181 | 188Os | 193Pt | syn | 50 y | ε | - | 193Ir | 194Pt | 32.967% | - | (α) | 1.5045 | 190Os | 195Pt | 33.832% | - | (α) | 1.1581 | 191Os | 196Pt | 25.242% | - | (α) | 0.7942 | 192Os | 198Pt | 7.163% | >3.2×1014 y | (α) | 0.0870 | 194Os | (β−β−) | 1.0472 | 198Hg | Decay modes in parentheses are predicted, but have not yet been observed | |
· r |
प्वलाख वा Platinum छता रसायनिक तत्त्व ख। थ्व तत्त्वया रसायनिक चिं Pt ख। थ्व तत्त्वया एतमिक ल्या ७८ ख।