The lanthanide and actinide rows are typically separated from the rest of the periodic table to conserve space. However, the version of the table known as the wide periodic table incorporates these rows in the main body of the table
The main families of the periodic table are the alkali metals, the alkaline earth metals, the halogens, and the noble gasses. see them here to view where they are one the periodic table.. hopefully this answers your question.
A lanthanide element is any element that resides in the Lanthanide series on the Periodic Table. The Lanthanide series is just under the Actinide series on the Periodic Table and is usually seperated from the main part of the Periodic Table. All of the Lanthanide elements are radioactive.
Drawbacks of modern periodic table: 1.Hydrogen resembles both the alkali metals and halogens But it has been placed with the alkalis. 2.The lanthanides and actinides have not been placed in the main body of the table. 3.Place of Multivalent elements is not sure in the modern periodic table.