1 janv. 1898 - Neon
Description:
Ramsay suggested in 1898 existence of a gas between helium and argon with an atomic weight of 20 after its discovery later that year , Ramsay continued to interpret it as a member of a horizontal triad at the end of that period.Ajouté au bande de temps:
Date:
1 janv. 1898
Maintenaint
~ Il y a 127 ans