Discovered By: Antonio de Ulloa
Discovery year: 1735

The following table showing some properties of Platinum(Pt):

Table Example
Atomic number 78
Group 10
Period 6
Block d
Electrons 78
Protons 78
Neutrons 117
Atomic weight 195.084
Oxidation states +2, +4
Ionic charge Pt^4+, Pt^2+


Table Example
Electrons per shell K2 L8 M18 N32 O17 P1
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^1 4f^14 5d^9
Atomic radius 177 pm
Covalent radius 136 pm
Van der Waals radius 175 pm
Boiling point 3825°C
Melting point 1768.3°C
Phase Solid
Fusion heat 20 kJ.mol^-1
Vaporization heat 490 kJ.mol^-1


Table Example
Thermal expansion 8.8*10^-6 K^-1
Color Gray
Brinell hardness 392 MPa
Bulk modulus 230 GPa
Density 21450 kg.m^-3
Liquid density 19770 kg.m^-3
Mohs hardness 3.5
Poisson ratio 0.38
Shear modulus 61 GPa
Sound speed 2680 m.s^-1


Table Example
Vickers hardness 549 MPa
Young's modulus 168 GPa
Electrical type Conductor
Magnetic type Paramagnetic
Resistivity 1.1*10^-7 Ohm.m/td>
Electronegativity 2.28
Valence 6
Electron affinity 205.3 kJ.mol^-1
First ionization energy 870 kJ.mol^-1
Radioactive No
Neutron cross section 10 barn