Samarium, properties of atom, chemical and physical properties

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

 

 


General information

 
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 %

Properties of an atom

 
The atomic mass (molar mass) 150,36(2) and. E. M. (g/mol)
Electronic configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s2 4f6
The radius of the atom 181 PM

Chemical properties

 
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

Physical properties

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