Se (Selenium) is an element with position number 34 in the periodic table.
Located in the IV period. Melting point: 217 ℃. Density: 4.82 g/cm3.
Electronic configuration of the Selenium atom in ascending order of orbital energies:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4
Electronic configuration of the Selenium atom in ascending order of the levels:
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4
Reduced electronic configuration Se:
[Ar] 3d10 4s2 4p4
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4
Electronic configuration of the Selenium atom in ascending order of the levels:
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4
Reduced electronic configuration Se:
[Ar] 3d10 4s2 4p4
Below is the electronic diagram of the Selenium atom
Distribution of electrons over energy levels in the Se atom
1-st level (K): 2
2-st level (L): 8
3-st level (M): 18
4-st level (N): 6
1-st level (K): 2
2-st level (L): 8
3-st level (M): 18
4-st level (N): 6
Valence electrons of Selenium
The number of valence electrons in a Selenium atom - 6.
Below are their quantum numbers (N - energy, L - angular momentum, M - magnetic moment, S - spin )
Below are their quantum numbers (N - energy, L - angular momentum, M - magnetic moment, S - spin )
| Orbital | N | L | M | S |
|---|---|---|---|---|
| s | 4 | 0 | 0 | +1/2 |
| s | 4 | 0 | 0 | -1/2 |
| p | 4 | 1 | -1 | +1/2 |
| p | 4 | 1 | 0 | +1/2 |
| p | 4 | 1 | 1 | +1/2 |
| p | 4 | 1 | -1 | -1/2 |
Oxidation states of Selenium: -2, +2, +4, +6
Other elements
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Electronic configurations of other elements
Arsenic (As) electron configurationBromine (Br) electron configuration
Electronic configuration table
