Selenium (Se) Properties |
ASelenium (ASe)
Properties 1/ |
Nuclear (34 protons/electrons)
- Atomic Number: 34
- Atomic Mass: 78.96
- Atomic Energy: 0.118 Ergs
- Group: 16; Period: 4
- Family: Non-Metals
- Bonding Radius: 1.16 Angstroms
- Atomic Radius: 1.22 Angstroms
- Atomic Volume: 16.45 cm3mol-1
- 30
Isotopes: 65Se
to 94Se
- Stable Isotopes: 74Se,
76Se, 77Se,
78Se, 80Se,
82Se
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Nuclear (34 Aprotons/positrons)
- Atomic Number: 34
- Atomic Mass: 78.96
- Atomic Energy: 0.118 Ergs
- Group: 16; Period: 4
- Family: Non-Metals
- Bonding Radius: 1.16 Angstroms
- Atomic Radius: 1.22 Angstroms
- Atomic Volume: 16.45 cm3mol-1
- 30 AIsotopes: 65ASe
to 94ASe
- Stable AIsotopes:
74ASe, 76ASe,
77ASe, 78ASe,
80ASe, 82ASe
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Physical
- Dark gray lustrous rods or dark red crystals
- Density: 4.79 g cm-3
- Melting Point: 217 oC
- Boiling Point: 684.9 oC
- Specific Heat: 0.32 J g-1 K-1
- Heat of Vaporization: 37.7 kJ mol-1
- Heat of Fusion: 6.69 kJ mol-1
- Electrical Conductivity: ? 106 cm-1 Ohm-1
- Thermal Conductivity: 0.0204 W cm-1 K-1
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Physical
- Dark gray lustrous rods or dark red crystals
- Density: 4.79 g/cm-3
- Melting Point: 217 oC
- Boiling Point: 684.9 oC
- Specific Heat: 0.32 J g-1 K-1
- Heat of Vaporization: 37.7 kJ mol-1
- Heat of Fusion: 6.69 kJ mol-1
- Electrical Conductivity: ? 106 cm-1 Ohm-1
- Thermal Conductivity: 0.0204 W cm-1 K-1
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Chemical
- Valance Number: -2, +,4, +6
- Electron Configuration: 2,8,18,6
- Electronegativity: 2.55
- 1st Ionization Potential: 9.75 Volts
- 2nd Ionization Potential: 21.2 Volts
- 3rd Ionization Potential: 30.8 Volts
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Chemical
- Valance Number: -6, -4, + 2
- Positron Configuration: 2,8,18,6
- Positronpositivity: 2.55
- 1st Ionization Potential: 9.75 Volts
- 2nd Ionization Potential: 21.2 Volts
- 3rd Ionization Potential: 30.8
Volts
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Identified by Jons
Berzelius
Sweden in 1817
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Identified by Norm Hansen in 2001
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