78Pt195.085
Transition Metald-block
Platinum
Element 78 on the periodic table, symbol Pt, group 10, period 6.
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".
Appearance: silvery white
Properties
- Atomic Number
- 78
- Atomic Mass
- 195.0849 u
- Group
- 10
- Period
- 6
- Block
- d-block
- Category
- Transition Metal
- State at 25 °C
- Solid
- Melting Point
- 2,041.4 K · 1,768.3 °C
- Boiling Point
- 4,098 K · 3,824.9 °C
- Density
- 21.45 g/cm³
- Atomic Radius
- 135 pm
- Electronegativity
- 2.28
- Oxidation States
- +2, +4
- Abundance in Crust
- 0.005 mg/kg
- Discovered
- 1735
- Discovered By
- Antonio de Ulloa
Electron Configuration
[Xe] 4f14 5d9 6s1
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1 4f14 5d9
Ionisation Energies (kJ/mol)
- 1. 870
- 2. 1,791
Elements near Platinum
Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.