Samarium

Atomic number

62

Atomic mass (u)

150.4

Category

Lanthanide

Standard state

Solid

Melting point

1073.85 °C (1347 K)

Boiling point

1793.85 °C (2067 K)

Density (g/cm³)

7.52

Electronegativity (Pauling)

1.17

Electron configuration

[Xe]6s2 4f6

Oxidation states

+3, +2

Atomic radius (pm)

229

First ionization energy (eV)

5.644

Discovery & recognition

Discovery year / period (PubChem)

1879

Discovery credited to (RSC)

Paul-Émile Lecoq de Boisbaudran

Date or period recorded by RSC

1879

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.

“Samarium is found along with other lanthanide metals in several minerals, the principal ones being monazite and bastnaesite.”

Royal Society of Chemistry · occurrence excerpt ↗

Continue the research

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.