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| Atomic Number | 34 |
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| Atomic Symbol | Se |
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| Atomic Weight | 78.96 amu |
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| Group | Non-Metal, 16 |
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| Form | Solid |
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| Density @ STP | 4.81 g/cm3 |
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| Melting Point | 180 °C (356 °F, 453.15 °K) |
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| Boiling Point | 685 °C (1265 °F, 958.15 °K) |
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| Heat of Fusion | 6.69 kJ/mol |
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| Heat of Vaporization | 95.48 kJ/mol |
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| First Ionization Potential | 9.75238 eV |
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| Electronegativity (on Pauling scale | 2.55 |
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| Specific Heat Capacity | 0.321 J/g K |
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| Ground State Electron Configuration | 4p4 |
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| Oxidation State(s) | +4, +6, -2 |
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| Stable Isotopes and Natural Abundance on Earth | 74Se, 0.89%; 76Se, 9.36%; 77Se, 7.63%; 78Se, 23.78%; 80Se, 49.61%; 82Se, 8.73% |
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| Selected Radioisotopes | 72Se, 75Se, 79Se |
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| Atomic Radius | 103 pm |
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| Crystal Structure | Monoclinic |
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| Discovered by | Berzelius, 1817
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