What are Actinoids and Lanthanoids?

Flynn_17

Actinides and Lanthanides are chemical elements. Nov 15 04, 12:57 PM

giantcomet4

I know but why are they called that and why are they at the bottom of the table and what are their characteristics? Nov 15 04, 1:02 PM

Flynn_17

They are at the bottom of the table because of the time of their discovery and the differences in their properties. Also, they don't fit into the classical table design. Incidentally, they have found 9 new elements. Darmstadtium Roentgenium Ununtrium Ununbium Ununquadium Ununpentium Ununhexium Ununseptium Ununoctium These will either be placed in the actinides section, or at the bottom of the transition metals. They were found when reacting Iron with a gas (argon or radon, I think) in a chamber under unusual conditions. Nov 15 04, 1:07 PM

BillyWhiz

The elements preceding the groups are lanthanum and actinium. The groups have unusual properties based on their electon distribution. Nov 15 04, 2:02 PM