SeleniumThis is a featured page

.v. My Nucleus .v.


  • Protons . 34
  • Electrons . 34
  • Neutrons . 45

Atomic Number: 34
Atomic Weight: 78.96
Classification: Nonmetal
Period Number: 4
Group Number: 16
Group Name: Chalcogen

Selenium Isotopes

Isotope



 Half Life


Se-73 7.15 hours
Se-74 Stable
Se-75 119.78 days
Se-76 Stable
Se-77 Stable
Se-78 Stable
Se-79 65000.0 years
Se-80 Stable
Se-82 Stable

Electron Dot Model



[[ My Electrons ]]

Electron Shell Configuration
1s2




















2s2


2p6














3s2


3p6











3d10
4s2


4p4


[Bohr Model of Selenium]





[Ar]3d104s24p4

Number of Energy Levels: 4
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 6


xx__My Properties__xx


Physical properties
Phase


 solid


Density (near r.t.) (gray) 4.81 g·cm−3
Density (near r.t.) (alpha) 4.39 g·cm−3
Density (near r.t.) (vitreous) 4.28 g·cm−3
Liquid density at m.p.


 3.99 g·cm−3
Melting point


 494 K
(221 °C, 430 °F)
Boiling point


 958 K
(685 °C, 1265 °F)
















Selenium can be prepared with either an amorphous or crystalline structure.

The color of amorphous selenium is either red, in powder form, or black, in vitreous form.

Crystalline monoclinic selenium is a deep red

Crystalline hexagonal selenium, the most stable, is a metallic gray.

Naturally contains six stable isotopes.

Fifteen other isotopes have been characterized



~ My Home ~


Levels In Humans
  • Blood/mg dm-3: 0.171
  • Bone/p.p.m: 1- 9
  • Liver/p.p.m: 0.35-2.4
  • Muscle/p.p.m: 0.42-1.9
  • Daily Dietary Intake: 0.006-0.2 mg
  • Total Mass In Avg. 70kg human: 10-65 mg
Selenium - Chemistry with Mr. Olson
Abundance
  • Earth's Crust/p.p.m.: 0.05
  • Seawater/p.p.m.:
    • Atlantic Suface: 4.6E-08
    • Atlantic Deep: 1.8E-07
    • Pacific Surface: 1.5E-08
    • Pacific Deep: 1.65E-07
  • Atmosphere/p.p.m.: N/A
  • Sun: N/A

I. Am. Selenium!


Native Selenium

Selenium - Se
Major Producers
  1. Belgium
  2. Canada
  3. Japan
  4. United States
Important Uses
Agriculture 1.
Chemicals 2.
Electronics 3.
Glass 4.

Energy of first ionisation


 940,7 kJ.mol -1
Energy of second ionisation


 2045 kJ.mol -1
Energy of third ionisation


 2973.7 kJ.mol -1
Standard potential


 - 0.77 V

\\ My Compounds //


Fluorides

  • SeF2: selenium (II) fluoride
  • FSeSeF: selenium (I) fluoride
  • SeSeF2: selenium (II, IV) fluoride
  • SeF4: selenium (IV) fluoride
  • SeF6: selenium (VI) fluoride

Chlorides


Bromides

  • SeBr: selenium (I) bromide
  • SeBr2: selenium (II) bromide
  • Se2Br2: selenium (I) bromide
  • [SeBr4]4: selenium (IV) bromide

Oxides

  • SeO2: selenium (IV) oxide
  • SeO3: selenium (VI) oxide

Sulfides

  • Se4S4: selenium (II) sulphide
  • Se2S6: selenium hexasulphide

Nitrides

  • Se4N4: selenium (III) nitride



>> My Story <<

DISCOVERED BY .x.
Jons Berzelius
DISCOVERED AT .x. Sweden
DISCOVERED IN .x. 1817
NAME ORIGIN .x.
Greek "Selene" (moon)
.: x :.
Berzelius reported the presence of tellurium in sulphuric acid from a Swedish factory, but later resolved that the impurity was actually Selenium.

Selenium - Chemistry with Mr. Olson
Jons Berzelius

|| My Jobs ||

.: production of photocells & solarcells for photographic use
:. converting a.c. electricity into d.c. & used in rectifiers
.: solid is a p-type semiconductor
:. photocopying
.: make ruby-colored glasses & enamels
:. additive for stainless steel

Its Importance

Selenium - Chemistry with Mr. Olson
Elemental selenium in different allotropic forms: black, gray, and red




Selenium - Chemistry with Mr. Olson
(Selenium found in Brazil nuts)








No user avatar
Selenium 		Latest page update: made by Selenium , Oct 21 2006, 11:33 PM EDT (about this update About This Update Selenium Edited by Selenium


view changes
- complete history)
Keyword tags: elements Selenium
More Info: links to this page

Threads for this page

Started By Thread Subject Replies Last Post
Anonymous Se4N3Br 0 Nov 21 2007, 10:13 AM EST by Anonymous
 
Thread started: Nov 21 2007, 10:13 AM EST  Watch
I want to know about its complexes
4  out of 4 found this valuable. Do you?    
Keyword tags: elements Selenium (edit keyword tags)

Anonymous  (Get credit for your thread)

Showing 1 of 1 threads for this page

Related Content

  (what's this?Related ContentThanks to keyword tags, links to related pages and threads are added to the bottom of your pages. Up to 15 links are shown, determined by matching tags and by how recently the content was updated; keeping the most current at the top. Share your feedback on Wetpaint Central.)
EEE Actinium Awesome site!
Se4N3Br Sodium Hydrogen
Nobelium with James Reid Helium Calcium