Noble gases Characterizing the Elements "Characterizing the Elements" Lanthanides Lanthanides & actanides (Los Alamos National Laboratory) Alkali metals "Characterizing the Elements" elements http://periodic.lanl.gov/metal.shtml Nonmetals Characterizing the Elements periodic.lanl.gov Actinides Alkaline earth metals Metalloid http://periodic.lanl.gov/metal.shtml Characterizing the Elements Transition metals elements lanl.gov "Characterizing the Elements" Halogens periodic.lanl.gov Post-transition metals