Samarium, properties of atom, chemical and physical properties.
Sm Samarium 62
150,36(2) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f6
Samarium — element of the periodic system of chemical elements D. I. Mendeleev, with atomic number 62. Located in the 3rd group (old classification — side subgroup of the third group), the sixth period of the periodic system. Belongs to the group of lanthanides.
General information
Properties of an atom
Chemical properties
Physical properties
Table of chemical elements of D. I. Mendeleev
Name
Samarium/ Samarium
Symbol
Sm
Room at the table
62
Type
Metal
Open
Mark Delafontaine, Switzerland, 1878, Lecoq de Babakan, France, 1879
Appearance, etc.
Rare earth metal in silver color
The contents in the earth’s crust
About 0.0006 %
The contents in the ocean
4,5×10-11 %
The atomic 150,36(2) and. E. M. (g/mol)
Electronic configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s2 4f6
The radius of the atom
181 PM
Oxidation
+3, +2
Valence
(+2), +3
Covalent radius
162 PM
The radius of the ion
(+3e) 96,4 PM
Electronegativity
Of 1.17 (scale of Pauling)
Energy of ionization (the first electron)540,1 kJ/mol (of 5.60 eV)
Electrode potential
-2,30 IN, -2,67 IN
Density (under normal conditions)
Of 7.52 g/cm3
Melting point
1072 °C (1345 K)
Boiling point
1900 °C (2173 K)
UD. the heat of fusion
Of 8.9 kJ/mol
UD. heat of evaporation
165 kJ/mol
Molar heat capacity
Of 29.5 j/(K·mol)
Molar volume
19,9 cm3/mol
The thermal conductivity (at 300 K)
13,3 W/(m·K)
The electrical conductivity in the solid phase
1,1×10 –6 Cm/m
Superconductivity at a temperature of
Hardness 412 MPa Vickers
The lattice structure
rhombohedral
The lattice parameters
aH = 3,621 Å, cH = 26,25 Å
The ratio c /a
7,25
Debye Temperature
166 To
Table of chemical elements of D. I. Mendeleev
