Seleno
34
Se
Grupo
16
Perio
4
Bloko
p
Protonoj
Elektronoj
Neŭtronoj
34
34
45
Ĝeneralaj Propraĵoj
Atoma Nombro
34
Atommaso
78,96
Amasa Nombro
79
Kategorio
Nemetaloj
Koloro
Griza
Radioaktiva
Ne
From the Greek word Selene, moon
Kristala Strukturo
Simpla Monokliniko
Historio
Selenium was first observed in about the year 1300 by the alchemist Arnold of Villanova.
Selenium was discovered in 1817 by Jöns Jacob Berzelius and Johan Gottlieb Gahn who noted the similarity of the new element to the previously-known tellurium.
In 1873, Willoughby Smith found that the electrical resistance of grey selenium was dependent on the ambient light.
Selenium was discovered in 1817 by Jöns Jacob Berzelius and Johan Gottlieb Gahn who noted the similarity of the new element to the previously-known tellurium.
In 1873, Willoughby Smith found that the electrical resistance of grey selenium was dependent on the ambient light.
Elektronoj per ŝelo
2, 8, 18, 6
Elektrona Agordo
[Ar] 3d10 4s2 4p4
Selenium deficiency in animals can lead to slow growth
Fizikaj Propraĵoj
Fazo
Solido
Denso
4,809 g/cm3
Fandpunkto
494,15 K | 221 °C | 429,8 °F
Bolpunkto
958,15 K | 685 °C | 1265 °F
Varmo de Fuzio
5,4 kJ/mol
Varmo de Vaporiĝo
26 kJ/mol
Specifa Varmo Kapacito
0,321 J/g·K
Krusta Abundo
5×10-6%
Universa Abundo
3×10-6%
CAS Nombro
7782-49-2
PubChem Kunmetita Identiga Nombro
6326970
Atomaj Propraĵoj
Atoma Radiuso
120 pm
Kovalenta Radiuso
120 pm
Elektronegativeco
2,55 (Pauling-skalo)
Potencialo de jonigo
9,7524 eV
Atoma Volumo
16,45 cm3/mol
Termika Kondukto
0,0204 W/cm·K
Oksidaj Ŝtatoj
-2, 2, 4, 6
Aplikoj
Selenium is used in the glass industry to decolorize glass and to make red-colored glasses and enamels.
It is used as a catalyst in many chemical reactions.
It is also used as a photographic toner, and as an additive to stainless steel.
Selenium sulfide is used in anti-dandruff shampoos.
It is used as a catalyst in many chemical reactions.
It is also used as a photographic toner, and as an additive to stainless steel.
Selenium sulfide is used in anti-dandruff shampoos.
Many of selenium's compounds, such as selenates and selenites, are highly toxic
Izotopoj
Stabilaj Izotopoj
74Se, 76Se, 77Se, 78Se, 80SeMalstabilaj Isotopoj
65Se, 66Se, 67Se, 68Se, 69Se, 70Se, 71Se, 72Se, 73Se, 75Se, 79Se, 81Se, 82Se, 83Se, 84Se, 85Se, 86Se, 87Se, 88Se, 89Se, 90Se, 91Se, 92Se, 93Se, 94Se