Electronic data		Thermal data		Steric data
Shells: 2,8,18,24,8,2 Orbitals: [Xe] 4f6 6s2 Electronegativity: 1.1, -- 1. Ionization potential: 5.6437 eV 2. Ionization potential: 11.069 eV 3. Ionization potential: 23.423 eV Oxidation states: 3,2 Electrical conductivity: 0.00956 10^6		Melting point: 1074 °C Boiling point: 1794 °C Specific heat: 0.20 J/gK Heat of fusion: 8.630 kJ/mol Heat of vaporization: 166.40 kJ/mol Thermal conductivity: 0.133 W/cmK		Atomic radius: 2.59 Å Ionic radius: 1.08 Å () Covalent radius: 1.62 Å Atomic volume: 19.95 cm³/mol Density (293 K): 7.54 g/cm³ Crystal structure: Rhombohedral

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
144Sm	3.09	143.912	0	--	stable	--
145Sm	0	145	7/2	340d	EC	View
146Sm	0	145.913	0	1.03E08y		View
147Sm	14.97	146.915	7/2	1.06E11y		View
148Sm	11.24	147.915	0	7E15y		View
149Sm	13.83	148.917	7/2	--	stable	--
150Sm	7.44	149.917	0	--	stable	--
151Sm	0	151	5/2	90.0y	-	View
152Sm	76.72	151.92	0	--	stable	--
153Sm	0	153	3/2	1.929d	-	View
154Sm	22.71	153.922	0	--	stable	--

Legend

Name origin:	Named after the mineral samarskite.
Description:	Silvery rare earth metal.
Discovered by:	Paul émile Lecoq de Boisbaudran
Year:	1879
Place:	France
Sources:	Found with other rare earths in monazite sand. The sand is often 50% rare earths by weight and 2.8% samarium.
Use(s):	It is used in the electronics and ceramics industries. It is easily magnetized and very difficult to demagnetize. This suggests important future applications in solid-state and superconductor technologies.