Name: Selenium

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Term Paper Title	Name: Selenium
# of Words	313
# of Pages (250 words per page double spaced)	1.25

Name: Selenium
Symbol: Se
atomic number:  34
Atomic weight: 78.96
Density @ 293 K: 4.79 g/cm3
Atomic volume: 16.45 cm3/mol
Classification: Non-Metal, Chalcogen
Date Discovered: 1818
State(s): solid
Melting point: 490.2 K or 217.0  C
Boiling point: 958 K or 684.9 C
Heat of fusion: 6.694 kJ/mol
Heat of vaporization: 37.70 kJ/mol

Energies:
1st ionization energy: 940.9 kJ/mole
Electro Negativity: 2.55
2nd ionization energy: 2044.5 kJ/mole
Electron affinity: 194.97 kJ/mole
3rd ionization energy: 2973.7 kJ/mole
Specific heat: 0.32 J/gK
Heat atomization: 227 kJ/mole atoms

Oxidation & Electrons:

                    Shells
                                     2,8,18,6
                                               electron configuration
                                                                        [Ar] 3d10 4s2 4p4
          minimum oxidation number
                                       -2
                                            maximum oxidation number
                                                                              6
          min. common oxidation no.
                                       -2
                                            max. common oxidation no.
                                                                              6



                                Appearance & Characteristics

                       structure
                                    parallel chains
                                                        color
                                                                   black
                         uses
                                 Xerography, medicines
                                                       toxicity
                                                                    yes
                       hardness
                                       2 mohs
                                                    characteristics
                                                                   6 forms

                                           Reactions

         reaction with air
                             vigorous, w/ht =>SeO2
                                                 reaction with 6M HCl
                                                                              none
       reaction with 6M HCl
                                    none
                                                reaction ...

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