The protactinium atomic mass oxidation number valence density boiling point melting point physical chemical properties the structure of the conductivity the conductivity of the crystal lattice

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

 

 

 

Pa 91 Protactinium

231,03588(2) 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f2 6d1 7s2

 

The protactinium — an element of the periodic system of chemical elements of Mendeleev with atomic number 91. Located in the 3rd group (old classification — side subgroup of the third group), the seventh period of the periodic system. Belongs to the group of actinides.

 

General information

Properties of an atom

Chemical properties

Physical properties

Table of chemical elements of D. I. Mendeleev

 


General information

 
Name The Protactinium/ Protactinium
Symbol Pa
Room at the table 91
Type Metal
Open Casimir Faience and Oswald, Helmut, Germany, 1913
Appearance, etc. A shiny silver-white, very radioactive metal
The contents in the earth’s crust Of 9.9×10-13 %
The contents in the ocean 2,0×10-23 %

Properties of an atom

 
The atomic mass (molar mass) 231,03588(2) and. E. M. (g/mol)
Electronic configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f2 6d1 7s2
The radius of the atom 161 PM

Chemical properties

 
Oxidation +4, +5
Valence +5
Covalent radius 200 PM
The radius of the ion (+5e) 89 (+3e) 113 PM
Radius van der Waals
Electronegativity 1,5 (scale Pauling)
Energy of ionization (the first electron) 568 kJ/mol (of 5.89 eV)
Electrode potential -1,83 IN, 0.7 IN

Physical properties

Density (under normal conditions) Of 15.37 g/cm3
Melting point 1568 °C (1841 K)
Boiling point 4027 °C (4300 K)
UD. the heat of fusion 16.7 kJ/mol
UD. heat of evaporation 481,2 kJ/mol
Molar heat capacity To 27.7 j/(K·mol)
Molar volume 15,0 cm3/mol
The thermal conductivity (at 300 K) 47 W/(m·K)
The electrical conductivity in the solid phase 5 6X106 Cm/m
Superconductivity at a temperature of
Hardness
The lattice structure tetragonal
The lattice parameters a = 3,925 Å, c = Å 3,238
The ratio c/a 0,82
Debye Temperature

 

Table of chemical elements of D. I. Mendeleev