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
