ELEMENTLE

Element 78 · Transition Metal

Platinum

Period 6 · Group 10

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".

Three reasons Platinum stands out

  1. 1

    Used in jewelry, catalytic converters, and fuel cells.

  2. 2

    A compound of this metal called cisplatin is one of the most widely used and effective chemotherapy drugs in the world.

  3. 3

    Spanish conquistadors initially dismissed it as inferior silver and called it "little silver" due to its appearance.

A noble metal that also fights cancer

Platinum is dense, workable, and exceptionally resistant to corrosion. Its surface catalyzes reactions in exhaust systems, fuel cells, and chemical plants. Platinum compounds behave very differently from the metal: cisplatin damages DNA and became one of medicine’s most important chemotherapy drugs.

Platinum at a glance
Atomic number / protons78
SymbolPt
Family (Elementle)Transition Metal
Classification (PubChem)Transition metal
Period6
Group10
Atomic mass (u)195.08
Standard stateSolid
Electron configuration[Xe]6s1 4f14 5d9
Reported oxidation states+4, +2
Electronegativity (Pauling)2.28
Atomic radius (pm)209
First ionization energy (eV)9
Electron affinity (eV)2.128
Density (g/cm³)21.46
Melting point2041.55 K (1,768.4 °C)
Boiling point4098 K (3,824.85 °C)
Discovery (PubChem)1735

Values are reference data, not a specification for every temperature, pressure, or allotrope. Unknown properties are left unavailable. Superheavy-element predictions remain uncertain.

Sources & further reading

PubChem: Platinum · Platinum on Wikipedia

The introduction and original editorial story are adapted from Wikipedia contributors via Periodic-Table-JSON. Element descriptions and their adaptations are available under CC BY-SA 3.0. Numerical attributes use the PubChem periodic-table dataset, retrieved September 22, 2026.