Technical Data for the element Selenium in the Periodic Table

Name:

Selenium

Symbol:

Atomic Number:

Atomic Weight:

78.96(3)

Density:

4.79 g/cc

Melting Point:

216.85 C

Boiling Point:

684.95 C

Electron Configuration:

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁴

Chemical Group:

Non-Metals

Detailed Technical Data

The data on this page is more precise and in some cases more up-to-date than the data engraved on the wooden tiles. But as always, never believe one source if the number really matters. Density, melting point and boiling point data is particularly variable and uncertain.

Atomic weight data for stable elements from IUPAC 1999 Official Publication. (Uncertainty in parentheses.)

Special notes for this element from IUPAC publication:
Range in isotopic composition of normal terrestrial material prevents a more precise Ar(E) being given; the tabulated Ar(E) value should be applicable to any normal material.