Samarium 62

Atomic No. Order:

Alphabetic Order:

2, 8, 18,

24, 8, 2

Sm
62

Pu
94

Uqq
144

Ueq
194

Samarium

Symbol

Atomic Number

Relative Atomic Mass
¹²C = 12.0000

150.36 (±3) [Since 1979]

Atomic Radius pm

180

First Ionisation Energy
kJ mol ^-1

543.3

Ionisation Energy (eV)

5.64365

Electronegativity

1.17

Density kg m ^-3

7520 [293 K]

Molar Volume cm ³

20.00

Thermal Conductivity
W m ^-1 K ^-1

13.3 [300 K]

Melting Point K

1350

Boiling Point K

2064

Number of Isotopes

Isotope Atomic mass/u Mole fraction

144Sm 143.911 996(4) 0.0307(7)
147Sm 146.914 894(3) 0.1499(18)
148Sm 147.914 818(3) 0.1124(10)
149Sm 148.917 180(3) 0.1382(7)
150Sm 149.917 272(3) 0.0738(1)
152Sm 151.919 729(3) 0.2675(16)
154Sm 153.922 206(3) 0.2275(29)

Inner/outer Shells

Inner/outer Orbitals

Filling Orbital

4f ⁶

Ground State Electron Configuration

[Xe]

4f ⁶

5p ⁶

6s ²

Ground State Electron Configurati on with free Orbitals (n=24)

0, 0, 0, 8, 10, 6

Ground State Electron Configuration with compressed Orbitals (n=96)

0, 0, 0, 0, 32, 64

Singularity

182

	s	p	d	f		g	h	i	j
1	2
2	2	6
3	2	6	10
4	2	6	10	6	8
5	2	6	10	14		18
6	2	6	10	14		18	22
7
8

Term Symbol

⁷F₀

Discovery

It was originally discovered in 1878 by the Swiss chemist Marc Delafontaine, who called it decipium. It was also discovered by the French chemist Paul-Émile Lecoq de Boisbaudran (Paris, France) in 1879. In 1881, Delafontaine determined that his decipium could be resolved into two elements, one of which was identical to Boisbaudran's samarium. In 1901, the French chemist Eugène-Anatole Demarçay showed that this samarium earth also contained europium.

Name Derived From

The name derives from the mineral samarskite, in which it was found and that had been named for Colonel Samarski, a Russian mine official.

APSIDIUM ©	Created:		2002-07-29		062.pdf
	Page update:		2004-12-21		062.pdf