chemicalelements.info

Selenium

34
Se
Selenium
78.971

Properties

Symbol:Se
Atomic Number:34
Atomic Weight:78.971
Density:4.809 g/cm3
Melting Point:
494K
221°C
429°F
Boiling Point:
958K
685°C
1265°F

Electron Shells

2, 8, 18, 6

Selenium (Se) is a chemical element with atomic number 34. There are multiple stable selenium isotopes, but 80Se (34 protons, 46 neutrons) is the most common one.

Selenium has a wide variety of applications. The largest one is in glass production, but two other notable uses of selenium are in fertilizers and in lithium batteries.