Platinum

Atomic number

78

Atomic mass (u)

195.08

Category

Transition metal

Standard state

Solid

Melting point

1768.4 °C (2041.55 K)

Boiling point

3824.85 °C (4098 K)

Density (g/cm³)

21.46

Electronegativity (Pauling)

2.28

Electron configuration

[Xe]6s1 4f14 5d9

Oxidation states

+4, +2

Atomic radius (pm)

209

First ionization energy (eV)

9

Discovery & recognition

Discovery year / period (PubChem)

1735

Discovery credited to (RSC)

No individual discoverer recorded by this source

Date or period recorded by RSC

Known to native South Americans before Columbus, and taken to Europe around 1750

Discovery place

Not supplied in the structured record; see the RSC history source.

An ancient date does not identify a first human discovery. Different references may date observation, isolation and formal recognition differently.

Natural occurrence & production

The creation of an element’s nuclei and its concentration into terrestrial deposits are different processes. The occurrence note below concerns its presence or production on Earth; it is not a complete account of nucleosynthesis.

“Platinum is found uncombined in alluvial deposits.”

Royal Society of Chemistry · occurrence excerpt ↗

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Reference values are not product specifications. Blank values have not been estimated. For superheavy elements, some properties and family assignments are theoretical or incompletely measured.