Platinum

Koushik 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08
Property Value
Atomic Number 78
Element Platinum
Symbol Pt
Atomic Mass 195.084 u
Number of Neutrons 117 (most common isotope, Platinum-195)
Number of Protons 78
Number of Electrons 78
Period 6
Group 10
Phase Solid
Radioactive No
Natural Yes
Metal Yes
Nonmetal No
Metalloid No
Type Transition Metal
Atomic Radius 177 pm
Electronegativity 2.28 (Pauling scale)
First Ionization Energy 8.958 eV
Density 21.45 g/cm³
Melting Point 1768.3 °C
Boiling Point 3825 °C
Number of Isotopes 6 stable (Pt-190, Pt-192, Pt-194, Pt-195, Pt-196, Pt-198)
Discoverer Known since ancient times
Year Unknown
Specific Heat 0.133 J/g·K
Number of Shells 6
Number of Valence Electrons 10
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