Symbol
Pt
Atomic Number
78
Atomic Mass
195.084
Protons
78
Neutrons
117
Electrons
78
Type
Transition Metal
Isotopes
Platinum-194, Platinum-195, Platinum-196, Platinum-198
Discovery Year
1735
Discovered By
Antonio de Ulloa
Group
10
Period
6
Boiling Point
5700°F
Melting Point
3215°F
Electron Configuration
[Xe] 6s² 4f¹⁴ 5d⁹
Density (g/cm³)
21.45
Crystal Structure
Cubic
Magnetism
Diamagnetic
Abundance in Earth's Crust
0.005%
Phase at Room Temperature
Solid