#78
Platinum
transition metal· Solid·195.0849 u
Platinum is a chemical element with symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, gray-white transition metal. Its name is derived from the Spanish term platina, which is literally translated into "little silver".
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Identity
- Symbol
- Pt
- Atomic Number
- 78
- Atomic Mass
- 195.0849 u
- Category
- transition metal
- Block
- d-block
- Period
- 6
- Group
- 10
- Appearance
- silvery white
- Year Discovered
- 1735 CE
- Discovered By
- Antonio de Ulloa
- Named By
- silver
Electrons
- Configuration
- [Xe] 4f14 5d9 6s1
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1 4f14 5d9
- Shells
- 2, 8, 18, 32, 17, 1
- Electronegativity
- 2.28
- Electron Affinity
- 205.041
- Oxidation States
- +4, +2
- Ionization Energies
- 870, 1791
Physical Properties
- State at
- Solid
- Melting Point
- 2041.4
- Boiling Point
- 4098
- Density
- 21.45
- Molar Heat
- 25.86 J/(mol·K)
- Crystal Structure
- FCC
- Magnetic Ordering
- Paramagnetic
Mechanical
- Covalent Radius
- 136 pm
- Van der Waals
- 209 pm
- Metallic Radius
- 139 pm
- Mohs Hardness
- 3.5
- Brinell Hardness
- 392 MPa MPa
- Vickers Hardness
- 549 MPa MPa
- Bulk Modulus
- 230 GPa GPa
- Shear Modulus
- 61 GPa GPa
- Young's Modulus
- 168 GPa GPa
Thermal & Electrical
- Thermal Conductivity
- 71.6 W/(m K) W/(m·K)
- Electrical Conductivity
- 9.66 MS/m S/m
- Specific Heat
- 133 J/(kg K) J/(g·K)
- Heat of Vaporization
- 510 kJ/mol kJ/mol
- Heat of Fusion
- 22.2 kJ/mol kJ/mol
Abundance
- Universe
- 5.00 ppb
- Sun
- 9.00 ppb
- Meteorite
- 1 ppm
- Earth's Crust
- 5.00 ppb
- Ocean
- 5 ppt
- Human Body
- 0