The 2 bottom rows separated from the rest
Lanthanides and Actinides are placed separately as the properties of these elements is quite different from the elements in periodic table.
Lanthanides and Actinides.
Lanthanides and Actinides probably
Rare Earth elements or lanthanides are placed in the period 6 of the periodic table of Mendeleev. Actinoids are placed in the period 7 of the periodic table of Mendeleev.
At the bottom of the Periodic Table
The Lanthanides and the Actinides have been moved in the periodic table simply to save space. --PainRain
Lanthanides and actinides (or f-block elements).
Lanthanides & Actinides
they are not placed from elements 57-70.
The Lanthanides and the Actinides.
LAnthanides and actinides
The periodic table of elements is a chart that organizes the elements and emphasizes their shared traits and commonalities. All the known elements and their atomic number are on the periodic table.