Main Question or Discussion Point
I have a question about lanthanides and actinides.... is there any reason that they broke both the lanthanides and actinides from the periodic table?
That is not necessarily the case. This website - chemlab.pc.maricopa.edu/periodic/periodic.html - has alternative forms of the periodic table, however there seems to be some problem with it at the time this is posted. But the main idea is that there are alternate forms that do not 'break out' the lathanides and actinides. They are grouped however for reasons of similarity in some chemical properties. For example, the lanthanides tend to form 3+ valences, and so the oxides are generally M2O3. The atomic radii are fairly close for the lanthanides and actinides - http://www.webelements.com/webelements/properties/text/image-balls/atomic-radius-emp.htmlmickeyw said:I have a question about lanthanides and actinides.... is there any reason that they broke both the lanthanides and actinides from the periodic table?