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

Neptunium, the properties of atoms, chemical and physical properties.

 

 

 

Np 93 Neptunium

237,048 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 6d1 5f4 7s2

 

Neptunium — the element of the periodic system of chemical elements D. I. Mendeleev, with atomic number 93. 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 Neptunium/ Neptunium
Symbol Np
Room at the table 93
Type Metal
Open E. M. McMillan and Phillip H. Abelson, USA, 1940
Appearance, etc. Silvery-white radioactive soft metal
The contents in the earth’s crust 0 %. Obtained by synthesis.
The contents in the ocean 0 %

Properties of an atom

 
The atomic mass (molar mass) 238,02891(3) and. E. M. (g/mol)
Electronic configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 6d1 5f4 7s2
The radius of the atom 130 PM

Chemical properties

 
Oxidation +7, +6, +5, +4, +3, +2
Valence +3, +4, +5, +6, +7
Covalent radius 190±1 PM
The radius of the ion (+4e) 95 (+3e) 110 PM
Radius van der Waals
Electronegativity Of 1.36 (Pauling scale)
Energy of ionization (the first electron) 604,5 kJ/mol (of 6.26 eV)
Electrode potential IN -1,30, IN -1,79 OF -0.3 IN

Physical properties

Density (under normal conditions) Of 20.25 g/cm3
Melting point 640 °C (913 K)
Boiling point 3902 °C (4175 K)
UD. the heat of fusion Of 5.19 kJ/mol
UD. heat of evaporation 336 kJ/mol
Molar heat capacity Of 29.62 j/(K·mol)
Molar volume 21,1 cm3/mol
The thermal conductivity (at 300 K) 6,3 W/(m·K)
The electrical conductivity in the solid phase 0,83х106 Cm/m
Superconductivity at a temperature of
Hardness
The lattice structure orthorhombic
The lattice parameters a = 6,663 Å, b = 4,723 Å, c = Å 4,887
Debye Temperature

 

Table of chemical elements of D. I. Mendeleev