Technical data for Platinum

Overview
NamePlatinum
SymbolPt
Atomic Number78
Atomic Weight195.078
Density21.09 g/cm3
Melting Point1768.3 °C
Boiling Point3825 °C

Thermal properties
PhaseSolid
Melting Point1768.3 °C
Boiling Point3825 °C
Absolute Melting Point2041.4 K
Absolute Boiling Point4098 K
Heat of Fusion20 kJ/mol
Heat of Vaporization490 kJ/mol
Heat of CombustionN/A
Specific Heat133 J/(kg K)[note]
Thermal Conductivity72 W/(m K)
Thermal Expansion8.8×10-6 K-1

Bulk physical properties
Density21.09 g/cm3
Density (Liquid)19.77 g/cm3
Molar Volume9.2498×10-6
Brinell Hardness392 MPa
Mohs Hardness3.5 MPa
Vickers Hardness549 MPa
Bulk Modulus230 GPa
Shear Modulus61 GPa
Young Modulus168 GPa
Poisson Ratio0.38
Speed of Sound2680 m/s
Thermal Conductivity72 W/(m K)
Thermal Expansion8.8×10-6 K-1

Reactivity
Valence6
Electronegativity2.28
ElectronAffinity205.3 kJ/mol
Ionization Energies
870, 1791 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blockd
Group10
Period6
Electron Configuration[Xe]4f145d96s1
ColorGray
Discovery
1735 in Peru
Gas phaseN/A
CAS NumberCAS7440-06-4

Electrical properties
Electrical TypeConductor
Electrical Conductivity9.4×106 S/m
Resistivity1.1×10-7 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility1.22×10-8
Molar Magnetic Susceptibility2.38×10-9
Volume Magnetic Susceptibility0.0002573

Abundances
% in Universe5×10-7%
% in Sun9×10-7%
% in Meteorites0.000098%
% in Earth's Crust3.7×10-6%
% in OceansN/A
% in HumansN/A

Atomic dimensions and structure
Atomic Radius177 pm
Covalent Radius128 pm
Van der Waals Radius175 pm
Crystal StructureFace Centered Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
392.42, 392.42, 392.42 pm
Space Group NameFm_ 3m
Space Group Number225

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
192Pt, 194Pt, 195Pt, 196Pt, 198Pt
Isotopic Abundances
190Pt0.014%
192Pt0.782%
194Pt32.967%
195Pt33.832%
196Pt25.242%
198Pt7.163%

Notes on the properties of Platinum:
Specific Heat: Value given for solid phase.