Selenium
Revision as of 15:51, 29 November 2010 by 98.218.70.223
| Selenium | |
|---|---|
| Se | |
| In situ availability: | |
| Necessity: | |
| Atomic number: | 34 |
| Atomic mass: | 78.96 |
| group: | 16 |
| period: | 4 |
| normal phase: | Solid |
| series: | Non-metals |
| density: | (gray) 4.81 g/cm3(alpha) 4.39 g/cm3(vitreous) 4.28 g/cm3 |
| melting point: | 494K, 221°C, 430°F |
| boiling point: | 958K, 685°C, 1265°F |
| P ← S → Cl | |
| As ← Se → Br | |
| Sb ← Te → I | |
| Atomic radius (pm): | 115 |
| Bohr radius (pm): | 103 |
| Covalent radius (pm): | 116 |
| Van der Waals radius (pm): | 190 |
| ionic radius (pm): | (-2) 198 |
| 1st ion potential (eV): | 9.75 |
| Electron Configuration | |
| 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 | |
| Electrons Per Shell | |
| 2, 8, 18, 6 | |
| Electronegativity: | 2.55 |
| Electron Affinity: | 2.02 |
| Oxidation states: | +/-2, 4, 6 |
| Magnetism: | ? |
| Crystal structure: | Hexagonal |
Selenium is a Non-metal in group 16.
It has a Hexagonal crystalline structure.
This element has 6 stable isotopes: 74, 76, 77, 78, 80, and 82.
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