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They are found below the Periodic Table because they would take up too much room in the periodic table
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EzraLanthanides and actinides are under period six and seven eventhough they were part of period six and seven. the best way to find Lanthanides and actinides is to find period six or seven. If you go to Barium or Radium, you will have a line that connects that elements and goes down and leads to a another two lines with names of elements. The top one is Lanthanides and bottom is the actinides.
The Lanthalides, with atomic numbers 57 to 71, are between Barium and Hafnium. The Actinides, numbers 89 to 103, are between Radium and Rutherfordium. In the layout of the table, the first member of each group (after which the group is named) is in its normal spot. The rest appear as two rows below the last known element - currently Organesson (no 118).
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What are the two periods of elements below the periodic table called?
The two periods below the periodic table are known as the lanthanides and actinides. These series consist of elements that fall within the f-block of the periodic table.
What two groups are removed from the main body of the periodic table?
Lanthanides and actinides are the two groups that are usually removed from the main body of the periodic table and placed below it to conserve space.
Where are the lanthanides and actinides placed on the periodic table?
At the bottom of the Periodic Table
Are group 12 on the periodic table lanthandies or actinides?
Group 12 elements on the periodic table are not lanthanides or actinides. They are transition metals, also known as the zinc group, which includes elements like zinc (Zn), cadmium (Cd), and mercury (Hg). Lanthanides and actinides are separate groups that are located in the inner transition metals section of the periodic table.
Why are the lanthanides and actinides placed in the periodic table and why?
The lanthanides are elements 57-71 and are inserted after barium (Ba) on the periodic table. The actinides are elements 89-103 and are inserted after radium (Ra) on the periodic table. The reason they are there is because of the filling of electron orbitals in the atoms of the elements. There are four known orbitals, the s, p, d, and f orbitals. The lanthanide and actinide blocks are the result of electrons being inserted into the f orbitals.
