Selenium Element Properties

Selenium

p33
As
Arsenic
p34
Se
Selenium
p35
Br
Bromine
General
Name(Selenium)
Symbol(Se)
Number(34)
Group Number(16)
Group(Non-Metal, Chalcogen)
Block(p)
Density(4.79 g/cm3)
Atomic Weight(78.96 g/mol)
Atomic Volume(16.45 cm3/mol)
Discover(1818)


States
State(Solid)
Melting Point(494 K)
Boiling Point(958 K)
Triple Point(Nil)
Critical Point(1766 K)
Heat of Fusion(6.69 kJ/mol)
Heat of Vaporization(95.48 kJ/mol)


Energies
First Ionization Energy(940.9 kJ/mole)
Second Ionization Energy(2044.5 kJ/mole)
Third 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 and Electrons
Shells(2,8,18,6)
Electron Configuration([Ar] 3d10 4s2 4p4)
Minimum Oxidation Number(-2)
Maximum Oxidation Number(6)
Minimum Common Oxidation Number(-2)
Maximum Common Oxidation Number(6)


Appearance and Characteristics
Crystal Structure(hexagonal)
Characteristics(6 forms)
Color(black)
Uses(Xerography, medicines)
Hardness(2 mohs)
Toxicity(Yes)


Reactions
Reaction with Air(vigorous, w/ht =>SeO2)
Reaction with 6M HCl(None)
Reaction with 15M HNO3(mild, =>H2SeO3, NOx)
Reaction with 6M NaOH(None)


Other Forms
Number of Isotopes(6)
Hydride(SeH2)
Oxide(SeO2 SeO3)
Chloride(Se2Cl2 Se4Cl16)


Radius
Atomic Radius(119 pm)
Ionic Radius (1+ ion)(Nil)
Ionic Radius (1- ion)(Nil)
Ionic Radius (2+ ion)(Nil)
Ionic Radius (2- ion)(184 pm)
Ionic Radius (3+ ion)(Nil)


Conductivity
Thermal Conductivity(0.52 J/m-sec-deg)
Electrical Conductivity(0 1/mohm-cm)
Polarizability(3.8 A3)


Abundance
Source(Cu smelting by-product)
Relation Abundance Solar System(1.793 log)
Abundance Earths Crust(-1.3 log)


p33
As
Arsenic
p34
Se
Selenium
p35
Br
Bromine

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