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Selenium is a chemical element; it has symbol Se and atomic number 34. It has various physical appearances, including a brick-red powder, a vitreous black solid, and a grey metallic-looking form.
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Selenium | 72Se | synth | 1.00 | infobox |
| Selenium | 74Se | 0.860% | 1.00 | infobox |
| Selenium | 75Se | synth | 1.00 | infobox |
| Selenium | 76Se | 9.23% | 1.00 | infobox |
| Selenium | 77Se | 7.60% | 1.00 | infobox |
| Selenium | 78Se | 23.7% | 1.00 | infobox |
| Selenium | 79Se | trace | 1.00 | infobox |
| Selenium | 80Se | 49.8% | 1.00 | infobox |
| Selenium | 82Se | 8.82% | 1.00 | infobox |
| Selenium | Appearance | grey metallic-looking, red, and vitreous black (not pictured) allotropes | 1.00 | infobox |
| Selenium | at T (K) | 500 | 1.00 | infobox |
| Selenium | Atomic number (Z) | 34 | 1.00 | infobox |
| Selenium | Atomic radius | empirical: 120 pm | 1.00 | infobox |
| Selenium | Block | p-block | 1.00 | infobox |
| Selenium | Boiling point | 958 K (685 °C, 1265 °F) | 1.00 | infobox |
| Selenium | Brinell hardness | 736 MPa | 1.00 | infobox |
| Selenium | Bulk modulus | 8.3 GPa | 1.00 | infobox |
| Selenium | CAS Number | 7782-49-2 | 1.00 | infobox |
| Selenium | Covalent radius | 120±4 pm | 1.00 | infobox |
| Selenium | Critical point | 1766 K, 27.2 MPa | 1.00 | infobox |
| Selenium | Crystal structure | grey: hexagonal (hP3) | 1.00 | infobox |
| Selenium | Density (near r.t.) | gray: 4.81 g/cm3 alpha: 4.39 g/cm3 vitreous: 4.28 g/cm3 | 1.00 | infobox |
| Selenium | Discovery and first isolation | Jöns Jakob Berzelius and Johann Gottlieb Gahn (1817) | 1.00 | infobox |
| Selenium | Electron configuration | [Ar] 3d10 4s2 4p4 | 1.00 | infobox |
| Selenium | Electronegativity | Pauling scale: 2.55 | 1.00 | infobox |
| Selenium | Electrons per shell | 2, 8, 18, 6 | 1.00 | infobox |
| Selenium | Group | group 16 (chalcogens) | 1.00 | infobox |
| Selenium | Heat of fusion | gray: 6.69 kJ/mol | 1.00 | infobox |
| Selenium | Heat of vaporization | 95.48 kJ/mol | 1.00 | infobox |
| Selenium | Ionization energies | 1st: 941.0 kJ/mol | 1.00 | infobox |
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