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Selenium Element Properties, Non-Metal, Chalcogen Group, Periodic Table of the Elements

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Selenium

Selenium Element Properties

p33
As
Arsenic
p34
Se
Selenium
p35
Br
Bromine
General
NameSelenium
SymbolSe
Number34
Group Number16
GroupNon-Metal, Chalcogen
Blockp
Density4.79 g/cm3
Atomic Weight78.96 g/mol
Atomic Volume16.45 cm3/mol
Discover1818


States
StateSolid
Melting Point494 K
Boiling Point958 K
Triple PointNil
Critical Point1766 K
Heat of Fusion6.69 kJ/mol
Heat of Vaporization95.48 kJ/mol


Energies
First Ionization Energy940.9 kJ/mole
Second Ionization Energy2044.5 kJ/mole
Third Ionization Energy2973.7 kJ/mole
Electronegativity2.55
Electron Affinity194.97 kJ/mole
Specific Heat0.32 J/gK
Heat Atomization227 kJ/mole atoms


Oxidation and Electrons
Shells2,8,18,6
Electron Configuration[Ar] 3d10 4s2 4p4
Minimum Oxidation Number-2
Maximum Oxidation Number6
Minimum Common Oxidation Number-2
Maximum Common Oxidation Number6


Appearance and Characteristics
Crystal Structurehexagonal
Characteristics6 forms
Colorblack
UsesXerography, medicines
Hardness2 mohs
ToxicityYes


Reactions
Reaction with Airvigorous, w/ht =>SeO2
Reaction with 6M HClNone
Reaction with 15M HNO3mild, =>H2SeO3, NOx
Reaction with 6M NaOHNone


Other Forms
Number of Isotopes6
HydrideSeH2
OxideSeO2 SeO3
ChlorideSe2Cl2 Se4Cl16


Radius
Atomic Radius119 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 Conductivity0.52 J/m-sec-deg
Electrical Conductivity0 1/mohm-cm
Polarizability3.8 A3


Abundance
SourceCu smelting by-product
Relation Abundance Solar System1.793 log
Abundance Earth's Crust-1.3 log


p33
As
Arsenic
p34
Se
Selenium
p35
Br
Bromine




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