| Element (Atom) Name | Selenium |
| Symbol | Se |
| Physical state at room temperature | Solid |
| Element Classification | non-metal |
| Group Name | Chalcogen |
| Period Number (Periodic table) | 4 |
| Group number (Periodic table) | 16 |
| Atomic number | 34 |
| Atomic weight | 78.971 (Ref: Jlab-ele034, ciaaw-selenium, Nist-34) 78.96 (Ref: Lanl-34) |
| Atomic Radius | 190 pm (Van der Waals) (Ref: Lanl-34) |
| Density | 4.809 g/ml (Ref: Jlab-ele034) |
| Melting point | 220.5°C (Ref: Jlab-ele034) 221 °C (Ref: Lanl-34) |
| Boiling point | 685°C (Ref: Jlab-ele034, Lanl-34) |
| Electron shell configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 |
| Oxidation States | +6, +4, -2 (Ref: Jlab-ele034) 6, 5, 4, 3, 2, 1, −1, −2 (a strongly acidic oxide) (Ref: Lanl-34) |
| Ionization Energy | 9.752 eV (Ref: Jlab-ele034) 9.752392 eV (Ref: Nist-34) |
| Number of Stable Isotopes | 6 |
| InChI | InChI=1S/Se (Ref: Pubchem-34) |
| InChI Key | BUGBHKTXTAQXES-UHFFFAOYSA-N (Ref: Pubchem-34) |
| Remarks |
REFERENCES
- Jlab-ele034: https://education.jlab.org/itselemental/ele034.html
- Lanl-34: https://periodic.lanl.gov/34.shtml
- ciaaw-selenium: https://www.ciaaw.org/selenium.htm
- Nist-34 : https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=34
- Pubchem-34: https://pubchem.ncbi.nlm.nih.gov/element/34
- science.co.il: https://www.science.co.il/elements/
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