Platinum

01 / A closer look

Meet Platinum

Platinum has atomic number 78: every atom of this element contains 78 protons. It belongs to period 6, group 10 of the periodic table.

In a neutral atom, the number of electrons equals the number of protons. Isotopes of this element share the same atomic number but have different neutron counts.

02 / Physical properties

Melting point

2041.4 K

Boiling point

4098 K

Density

21.5 g/cm³

Atomic weight

195.08 ± 0.02

Melting points, boiling points and densities follow RSC fact boxes. Density is referenced to room temperature; consult the source for pressure and allotrope details. These are reference values, not a claim that every value was experimentally measured. Atomic weights follow CIAAW.

Physical-property source: Royal Society of Chemistry ↗ · Reviewed 24 September 2026

Standard atomic weights follow CIAAW 2024 (abridged). Brackets show an isotope mass number from IUPAC 2022, not a standard atomic weight.

03 / Atomic structure

Atomic structure

Electron configuration

[Xe]6s1 4f14 5d9

Oxidation states

+4, +2

Electronegativity · Pauling

2.28

First ionisation energy

9 eV

Atomic radius

209 pm

04 / Where it is found

Where it is found

Native deposits and ores such as cooperite.

Production and export figures depend on the commodity and reporting year. No comparable country quantities have been included for this element in this edition.