Np (Neptunium) is an element with position number 93 in the periodic table.
Located in the VII period. Melting point: 640 ℃. Density: 20.48 g/cm3.
The order of filling the orbitals with electrons in the Np atom is an exception to the rule.
Expected electronic configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f5
But in reality, one electron moves from the 5f orbital to the 6d orbital:
Electronic configuration of the Neptunium atom in ascending order of orbital energies:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f4 6d1
Electronic configuration of the Neptunium atom in ascending order of the levels:
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f4 6s2 6p6 6d1 7s2
Reduced electronic configuration Np:
[Rn] 5f4 6d1 7s2
Expected electronic configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f5
But in reality, one electron moves from the 5f orbital to the 6d orbital:
Electronic configuration of the Neptunium atom in ascending order of orbital energies:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f4 6d1
Electronic configuration of the Neptunium atom in ascending order of the levels:
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f4 6s2 6p6 6d1 7s2
Reduced electronic configuration Np:
[Rn] 5f4 6d1 7s2
Below is the electronic diagram of the Neptunium atom
Distribution of electrons over energy levels in the Np atom
1-st level (K): 2
2-st level (L): 8
3-st level (M): 18
4-st level (N): 32
5-st level (O): 22
6-st level (P): 9
7-st level (Q): 2
1-st level (K): 2
2-st level (L): 8
3-st level (M): 18
4-st level (N): 32
5-st level (O): 22
6-st level (P): 9
7-st level (Q): 2
Oxidation states of Neptunium: +3, +4, +5, +6, +7
Other elements
Share the information with your friends
Electronic configurations of other elements
Uranium (U) electron configurationPlutonium (Pu) electron configuration
Electronic configuration table
