Explain the position in periodic table of Lanthanoids.
Answers
To complete our look at the periodic table there is one more group we have to consider. This group holds its own unique position in any pictorial representation of the Periodic Table. The two rows that are generally placed underneath the main Periodic Table are called the lanthanide series and the actinide series. These two rows are produced when electrons are being added to f orbitals. Therefore, this block of elements are referred to as the "f block". The lanthanides are also occasionally referred to the rare earth elements. The f block, as shown in the figure below, are the two rows in yellow.
Lanthanides are the inner transition of the elements which is present at the bottom of the periodic table.
The main elements that fall under this category are Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, etc. these are extremely rare or rare-earth element on the earth.