Platinum

Symbol | Pt
Latin name | Platinium
Atomic number | 78
Period | 6
Element category | Transition elements
Relative atomic mass | 195.08
Group | VIII.B
Electronegativity | 2.2
Oxidation numbers | 2, 4, 6
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d9 6s1
Density [g/cm3] | 21.45
State | Solid
Melting point [°C] | 1772
Boiling point [°C] | 3827
Atomic radius [pm] | 177
Covalent radius [pm] | 128
Thermal conductivity [W m-1K-1] | 71.6
Heat capacity [J K-1g-1] | 0.13
Discovery | 1735
Hardness [Mohs scale] | 4.3
Vickers hardness [MPa] | 549
Brinell hardness [MPa] | 392
Young's modulus [GPa] | 168
Electrical conductivity [S m-1] | 9.4 · 106
Electrical resistivity [10-6Ω.m] | 0.106
Shear modulus [GPa] | 61
1.st ionization energy [eV] | 9.0
2.nd ionization energy [eV] | 18.563
Stable isotopes | 6
Unstable isotopes | 28