Symbol	Sm
Atomnummer	62
Gruppe	-
Periode	6
Blok	f
Klassifikation	Lanthanider

Udseende	Silvery white
Farve	Sølv

Antal protoner	62 p+
Antal neutroner	88 n0
Antal elektroner	62 e-

Fra Wikipedia, den gratis encyklopædiSamarium (opkaldt efter mineralet samarskit, som igen er opkaldt efter Vasilij Samarskij-Bykhovets) er det 62. grundstof i det periodiske system, og har det kemiske symbol Sm: Under normale temperatur- og trykforhold optræder dette lanthanid som et sølvskinnende metal. Sammenlignet med andre lanthanider er samarium ikke særlig reaktionsvilligt, og er forholdsvis modstandsdygtigt over for iltning i atmosfærisk luft ved stuetemperatur. Til gengæld bryder det i brand ved temperaturer over 150 °C. Samarium antager en af tre krystalstrukturer afhængigt af temperaturen; ved temperaturer under 734 °C antager det α-formen, mellem 734 °C og 922 °C β-formen, og over 922 °C γ-formen.

Fase ved STP	Fast
Massefylde	7.52 g/cm3
Atommasse	150.362 u

Smeltepunkt	1345 K 1071.85 °C 1961.33 °F
Kogepunkt	2173 K 1899.85 °C 3451.73 °F
Fordampningsvarme	191.63 kJ/mol

Elektronegativitet (Pauling Scale)	1.17
Elektronaffinitet	15.63 kJ/mol
Oxidationstrin	0, +2, +3 (a mildly basic oxide)
Ioniseringsenergier	544.5 kJ/mol 1070 kJ/mol 2260 kJ/mol 3990 kJ/mol

Elektronkonfiguration Kortfattet konfiguration	[Xe] 4f6 6s2
Elektronkonfiguration Fuld konfiguration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f6 5s2 5p6 6s2
Elektronkonfigurationsdiagram	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f6 5s2 5p6 6s2
Elektroner pr. Skal	2, 8, 18, 24, 8, 2
Valenselektroner	2
Valency-elektroner	3
Bohrs atommodel	Figur: Skaldiagram af Samarium (Sm) atom.
Orbital diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 6s

Opdagelse og første isolation	Lecoq de Boisbaudran (1879)
Navngivet af	Lecoq de Boisbaudran
Opdagelse af samarium Detection of samarium and related elements was announced by several scientists in the second half of the 19th century; however, most sources give priority to French chemist Paul-Émile Lecoq de Boisbaudran. Boisbaudran isolated samarium oxide and/or hydroxide in Paris in 1879 from the mineral samarskite and identified a new element in it via sharp optical absorption lines. Swiss chemist Marc Delafontaine announced a new element decipium (from Latin: decipiens meaning "deceptive, misleading") in 1878, but later in 1880–1881 demonstrated that it was a mix of several elements, one being identical to Boisbaudran's samarium. Though samarskite was first found in the remote Russian region of Urals, by the late 1870s it had been found in other places, making it available to many researchers. In particular, it was found that the samarium isolated by Boisbaudran was also impure and had a comparable amount of europium. The pure element was produced only in 1901 by Eugène-Anatole Demarçay. Boisbaudran named his element samaria after the mineral samarskite, which in turn honored Vassili Samarsky-Bykhovets (1803–1870).

CAS Number	7440-19-9
ChemSpider ID	22391
EC number	231-128-7
PubChem CID Number	23951