Tabla

Electronic ConfigurationXe 6s2 4f6

Melting Point1077°C

Boiling Point1791°C

Density7.52g cm⁻³

Description

Soft silvery metallic element, belongs to the lanthanoids. Seven natural isotopes, ¹⁴⁷Sm is the only radioisotope, and has a half-life of 2.5*10^11 years. Used for making special alloys needed in the production of nuclear reactors. Also used as a neutron absorber. Small quantities of Samarium oxide is used in special optical glasses. The largest use of the element is its ferromagnetic alloy which produces permanent magnets that are five times stronger than magnets produced by any other material. Discovered by Francois Lecoq de Boisbaudran in 1879.

Covalent Radius172pm

Double134pm

Ionisation Energies

Oxidation States0, +2, +3

Uses

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.

Electronegativity1.17PAULING

Atomic Volume19.9cm³ mol⁻¹

Atomic Radius181pm

Van Der Waals Radius236pm

Sources

Found with other rare earths in monazite sand. The sand is often 50% rare earths by weight and 2.8% Samarium.

Discovery

Discovered in 1879 by Paul Émile Lecoq de Boisbaudran in France

Name Origin

Named after the mineral samarskite.

CAS7440-19-9

Crust Abundance7.05mg kg⁻¹

Sea Abundance4.50x10⁻⁷mg dm⁻³

Enthalpy of Vapourisation 165kJ mol⁻¹

Enthalpy of Fusion8.9kJ mol⁻¹

Enthalpy of Formation206.7kJ mol⁻¹

Specific Heat - 20°C0.18J (g ⋅ K)⁻¹

Isotope	Abundance	Half Life
144Sm	3.08%	-
147Sm	15%	1.066x10¹¹y
148Sm	11.25%	7.000x10¹⁵y
149Sm	13.82%	-
150Sm	7.37%	-
152Sm	26.74%	-
154Sm	22.74%	-
151Sm	-	-

https://reuben.science

https://github.com/reubn/tabla

Using data from mendeleev.

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