|In situ availability:|
|density:||(gray) 4.81 g/cm3|
(alpha) 4.39 g/cm3
(vitreous) 4.28 g/cm3
|P ← S → Cl|
|As ← Se → Br|
|Sb ← Te → I|
|Atomic radius (pm):||115|
|Bohr radius (pm):||103|
|Covalent radius (pm):||116|
|Van der Waals radius (pm):||190|
|ionic radius (pm):||(-2) 198|
|1st ion potential (eV):||9.75|
3s2 3p6 3d10
|Electrons Per Shell|
|2, 8, 18, 6|
|Oxidation states:||+/-2, 4, 6|
Selenium is a Non-metal in group 16. It was named after the Moon.
It has a Hexagonal crystalline structure.
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).Photocopying
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.
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