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Periodic Table - Elements - Selenium
| Symbol |
Se |
|
| Atomic Number |
34 |
Relative Atomic Mass
12C = 12.0000 |
78.96 |
Atomic Radius
pm |
215 |
First Ionisation Energy
kJ mol-1 |
940.9 |
| Electronegativity |
2.55 |
Density
kg m-3 |
4790 (grey) [293 K]
3987 [l., m.p.] |
Molar Volume
cm3 |
16.48 |
Thermal Conductivity
W m-1 K-1 |
2.04 [300 K] |
Melting Point
K |
490 |
Boiling Point
K |
958.1 |
| Number of Isotopes |
26 |
Ground State Electron
Configuration |
[Ar]3d104s24p4 |
| Term Symbol |
4P2 |
| Discovery |
Discovered by J.J. Berzelius (Stockholm, Sweden) in 1817 |
| Name Derived From |
Greek selene meaning 'moon' |
Name in Other
Languages |
 Croatian | Selenij |
 Danish | selen |
 Dutch | seleen |
 Finnish | seleeni |
 French | sélénium |
 German | Selen |
 Italian | selenio |
 Norwegian | selen |
 Portuguese | selénio |
 Spanish | selenio |
 Swedish | selen |
| Peter van der Krogt's Element Multidict - element name translations in over 48 langauges |
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Page compiled: Wed Sep 05 18:37:55 GMT+01:00 2001
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