The promethium atomic weight oxidation state valence density boiling point melting point physical chemical properties the structure of the conductivity the conductivity of the crystal lattice

The promethium, the properties of atoms, chemical and physical properties.

 

 

 

Pm 61 Promethium

144,9127 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f5

 

The promethium — element of the periodic system of chemical elements of Mendeleev with atomic number 61. 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 The PM/ Promethium
Symbol Pm
Room at the table 61
Type Metal
Open D. Marin, L. Glendenin and Part of Coryell, USA, 1885
Appearance, etc. Light-gray radioactive metal. Has no stable isotopes.
The contents in the earth’s crust 0 %. In nature practically does not occur. Obtained by synthesis.
The contents in the ocean 0 %

Properties of an atom

 
The atomic mass (molar mass) 144,9127 and. E. M. (g/mol)
Electronic configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s2 4f5
The radius of the atom 183 PM

Chemical properties

 
Oxidation +3
Valence +3
Covalent radius 199 PM
The radius of the ion (+3e)111 PM
Electronegativity 1,1 (scale Pauling)
Energy of ionization (the first electron) 536,0 kJ/mol (of 5.56 eV)
Electrode potential -2,29 In

Physical properties

Density (under normal conditions) Of 7.26 g/cm3
Melting point 1042 °C (1315 K)
Boiling point ~3000 °C (~3273 K)
UD. the heat of fusion Of 7.13 kJ/mol
UD. heat of evaporation 330,5 kJ/mol
Molar heat capacity Of 27.6 j/(K·mol)
Molar volume 19,96 cm3/mol
The thermal conductivity (at 300 K) 17.9 W/(m·K)
The electrical conductivity in the solid phase 1,3×106 s/m
Superconductivity at a temperature of
Hardness
The lattice structure hexagonal
The lattice parameters a = the 3.65 Å, c = 11,65 Å
The ratio c/a 3,19
Debye Temperature

 

Table of chemical elements of D. I. Mendeleev