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Visiting Scrap Metal Yards in Port Elizabeth, Cradock, Uitenhage and a...
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Metals, Building materials, Chemistry, Oil, Minerals... |
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Resources: Periodic table |
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Atomic symbol: Se |
Atomic number: 34 |
Atomic weight: 78.96 |
Atomic volume: 16.45 cm3/mol |
Density: 4.79 g/cm3 |
Period Number: 4 |
Group number: 16 |
Group name: Non-Metal, Chalcogen |
Element classification: Non-metal |
Phase at room temperature: Solid |
Melting Point: 490.2 K |
Boiling point: 958 K |
Heat of fusion: 6.694 kJ/mol |
Heat of vaporization: 37.70 kJ/mol |
Ionization Energy: 9.752 eV |
1st ionization energy: 940.9 kJ/mole |
2nd ionization energy: 2044.5 kJ/mole |
3rd ionization energy: 2973.7 kJ/mole |
Electronegativity: 2.55 |
Electron affinity: 194.97 kJ/mole |
Specific heat: 0.32 J/gK |
Heat atomization: 227 kJ/mole atoms |
Shells: 2,8,18,6 |
Electron Shell Configuration: [Ar] 3d10 4s2 4p4 |
Minimum oxidation number: -2 |
Maximum oxidation number: 6 |
Minimum common oxidation number: -2 |
Maximum common oxidation no: 6 |
Appearance & Characteristics |
Structure:: parallel chains |
Color: black |
Hardness: 2 mohs |
Toxicity: yes |
Characteristics: 6 forms |
Uses: Xerography, medicines |
Reaction with air: vigorous, w/ht =>SeO2 |
Reaction with 6M HCl: none |
Reaction with 15M HNO3: mild, =>H2SeO3, NOx |
Reaction with 6M NaOH: none |
Number of isotopes: 6 |
Oxide(s): SeO2 SeO3 |
Hydride(s): SeH2 |
Chloride(s): Se2Cl2 Se44Cl16 |
Atomic Radius: 119 pm |
Ionic radius (1- ion): pm |
Ionic radius (1+ ion): pm |
Ionic radius (2- ion): 184 pm |
Ionic radius (2+ ion): pm |
Ionic radius (3+ ion): pm |
Thermal conductivity: 0.52 J/m-sec-deg |
Electrical conductivity: 0 1/mohm-cm |
Polarizability: 3.8 A^3 |
Source: Cu smelting by-product |
Relative abundance solar system: 1.793 log |
Abundance earth's crust: -1.3 log |
Estimated crustal abundance: 5×10-2 milligrams per kilogram |
Estimated oceanic abundance: 2×10-4 milligrams per liter |
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