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Platinum

Metalsolid
Symbol: Pt
Atomic number: 78
Atomic mass: 195.08
Group: Transition Metal
CAS-number: 7440-06-4

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Physical data
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 17, 1
Orbitals: [Xe] 4f14 5d9 6s1
Electronegativity: 2.2, 1.4
1. Ionization potential: 9.0 eV
2. Ionization potential: 18.563 eV
3. Ionization potential: -- eV
Oxidation states: 4, 2, 0
Electrical conductivity: 0.0966 10^6
Melting point: 1772 °C
Boiling point: 3827 °C
Specific heat: 0.13 J/gK
Heat of fusion: 19.60 kJ/mol
Heat of vaporization: 510.0 kJ/mol
Thermal conductivity: 0.716 W/cmK
Atomic radius: 1.83 Å
Ionic radius: 0.63 Å (+4)
Covalent radius: 1.30 Å
Atomic volume: 9.10 cm³/mol
Density (293 K): 21.45 g/cm³
Crystal structure: cubic face centered
cubic face centered

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
188Pt 0 188 0 10.2d EC, α View
190Pt 0.0127 189.96 0 6E11y α View
191Pt 0 191 3/2 2.96d EC View
192Pt 0.78 191.961 0 -- --
193Pt 0 193 1/2 60y EC View
193Ptm 0 193 15/2 4.33d IT View
194Pt 32.9 193.963 0 -- --
195Pt 33.8 194.965 1/2 -- --
195Ptm 0 195 15/2 4.02d IT View
196Pt 25.3 195.965 0 -- --
197Pt 0 197 1/2 18.3h β- View
197Ptm 0 197 15/2 1.590h IT, β- View
198Pt 7.21 197.968 0 -- --

Other info

Name origin:Spanish: platina (little silver).
Description:Rare, very heavy, soft, silvery-white metal.
Discovered by:Julius Scaliger
Year:1735
Place:Italy
Sources:Produced from deposits of native, or elemental, platinum.
Use(s):Used in jewelry, to make crucible and special containers and as a catalyst. Used with cobalt to produce very strong magnets. Also to make standard weights and measures. Resists corrosion and acid attacks except aqua regia.