https://lunarpedia.org/api.php?action=feedcontributions&feedformat=atom&user=RkgronekLunarpedia - User contributions [en]2026-06-02T18:32:05ZUser contributionsMediaWiki 1.34.2https://lunarpedia.org/index.php?title=Selenium&diff=16023Selenium2010-12-08T20:50:19Z<p>Rkgronek: Added xerography and essential trace element</p>
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<div>{{Element |<br />
name=Selenium |<br />
symbol=Se |<br />
available= |<br />
need= |<br />
number=34 |<br />
mass=78.96 |<br />
group=16 |<br />
period=4 |<br />
phase=Solid |<br />
series=Non-metals |<br />
density=(gray) 4.81 g/cm3(alpha) 4.39 g/cm3(vitreous) 4.28 g/cm3 |<br />
melts=494K,<BR/>221°C,<BR/>430°F |<br />
boils=958K,<BR/>685°C,<BR/>1265°F |<br />
isotopes=74<BR/>76<BR/>77<BR/>78<BR/>80<BR/>82 |<br />
prior=[[Arsenic|<FONT color="#7F7FFF">As</FONT>]] |<br />
next=[[Bromine|<FONT color="#7F7FFF">Br</FONT>]] |<br />
above=[[Sulfur|<FONT color="#7F7FFF">S</FONT>]] |<br />
aprior=[[Phosphorus|<FONT color="#7F7FFF">P</FONT>]] |<br />
anext=[[Chlorine|<FONT color="#7F7FFF">Cl</FONT>]] |<br />
below=[[Tellurium|<FONT color="#7F7FFF">Te</FONT>]] |<br />
bprior=[[Antimony|<FONT color="#7F7FFF">Sb</FONT>]] |<br />
bnext=[[Iodine|<FONT color="#7F7FFF">I</FONT>]] |<br />
radius=115 |<br />
bohr=103 |<br />
covalent=116 |<br />
vdwr=190 |<br />
irad=(-2) 198 |<br />
ipot=9.75 |<br />
econfig=1s<sup>2</sup> <br/>2s<sup>2</sup> 2p<sup>6</sup> <br/>3s<sup>2</sup> 3p<sup>6</sup> 3d<sup>10</sup> <br/>4s<sup>2</sup> 4p<sup>4</sup> |<br />
eshell=2, 8, 18, 6 |<br />
enega=2.55 |<br />
eaffin=2.02 |<br />
oxstat=+/-2, '''4''', 6 |<br />
magn=? |<br />
cryst=Hexagonal |<br />
}}<br />
'''Selenium''' is a Non-metal in group 16. It was named after the Moon.<br />
It has a Hexagonal crystalline structure.<br />
This element has 6 stable isotopes: 74, 76, 77, 78, 80, and 82. It is a semiconductor whose resistance varies by exposure to light. This property is used in xerography (Greek for dry writing).[http://www.scienceclarified.com/Oi-Ph/Photocopying.html Photocopying]<br />
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Selenium (Se) is an essential micronutrient for many organisms, including plants, animals and humans. However, it is toxic if taken in excess. Intake of more than 400 micrograms per day can lead to selenosis in humans. It is used in some anti-dandruff shampoos to control dandruff by killing fungi on the scalp.<br />
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{{Autostub}}<br />
[[Category:Solids]]<br />
[[Category:Non-metals ]]<br />
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<!-- Generated by a gamma candidate version of Autostub2 (Test 9) --></div>Rkgronek