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Selenium, Atomic, number, volume, group, element, stayes, melting pot, boiling point, heat, ionization energy, oxidation, electron, reaction, isotiopes, ionic radius, Abundance, compounds,
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Atomic symbol: Se
Atomic number: 34
Atomic weight: 78.96
Atomic volume: 16.45 cm
3
/mol
Density: 4.79 g/cm
3
Period Number: 4
Group number: 16
Group name: Non-Metal, Chalcogen
Element classification: Non-metal
States
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
Energies
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
Oxidation & Electrons
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
Reactions
Reaction with air: vigorous, w/ht =>SeO
2
Reaction with 6M HCl: none
Reaction with 15M HNO3: mild, =>H
2
SeO
3
, NOx
Reaction with 6M NaOH: none
Other Forms
Number of isotopes: 6
Oxide(s): SeO
2
SeO
3
Hydride(s): SeH
2
Chloride(s): Se
2
Cl
2
Se
4
4Cl
16
Radius
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
Conductivity
Thermal conductivity: 0.52 J/m-sec-deg
Electrical conductivity: 0 1/mohm-cm
Polarizability: 3.8 A^3
Abundance
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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