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Se
Selenium
Atomic no.:
34
Atom. weight: 78
Density: 4
Class:
semi metal
Melting point: 217°C
Boiling point: 685°C
Colour: black, grey, red
   
Discoverer: Joens Jakob Berzelius
Place: Stockholm, Sweden
Year: 1817

Selenium was discovered in 1817 by J.J. Berzelius in Stockholm, Sweden. Selenium exists in several allotropic forms; red selenium is monoclinic and contains Se8 rings. It has a melting point of 180C and a relative density of 4.45. The grey (metallic) form of selenium is formed when other varieties are heated to 200C; this has a melting point of 220C and a relative density of 4.80. Selenium is widely distributed, mainly as the selenides of heavy metals, but only has an abundance of 0.05 ppm in the earth's crust. The metal burns in air and is unaffected by water. It is soluble in alkalis and concentrated nitric acid. The electrical properties of selenium are of particular interest as it is both photovoltaic (i.e. it becomes an electrical conductor when exposed to light or ultra violet radiation) and photoconductive (i.e. the electrical conductivity increases with increasing illumination). These properties mean that selenium has applications in the electronics industry (e.g. in the manufacture of photoelectric cells and solar cells). Selenium is used in the ceramics and glass industries (in the latter the element being used as a decoloriser and also in the manufacture of red glasses and enamels). Selenium is an important trace element for humans, the average body containing approximately 14 mg.

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 High pure Selenium bead 99.99% - ~ 4 grams  Art. Nr. 003720  
High pure Selenium bead 99.99% - ~ 4 grams
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High pure Selenium bead 99.99% - ~ 4 grams

Selenium Se - High purity shiny ingot. (You get the ingot on the right)

Danger
GHS Classification:

H301 Toxic if swallowed
H331 Toxic if inhaled
H373 May cause damage to organs through prolonged or repeated exposure
H413 May cause long lasting harmful effects to aquatic life
P260 Do not breathe dust/fume/gas/mist/vapours/spray
P273 Avoid release to the environment
P301+P310 IF SWALLOWED Immediately call a POISON CENTER or doctor/physician
P304+P340 IF INHALED Remove victim to fresh air and keep at rest in a position comfortable for breathing

 
Amount: 1 St.
Purity : 99.99%
Packing: PE bag
30.00
- tax free
5-9 pcs.: 29.00 Euro
Availability: 7 in stock

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