Question

which block elements are called lanthanides and actinides​

Answer 1

Lanthanides and actinides belong to the F block of the modern periodic table which makes up the inner transition metals. The two rows that are generally placed underneath the Periodic Table are called the lanthanide series and the actinide series.

Answer 2

Answer:

F block elements are divided into two series, namely lanthanoids and actinoids. These block of elements are often referred to as inner transition metals because they provide a transition in the periodic table which separates the s block and the d block elements.

Elements whose f orbital getting filled up by electrons are called f block elements. These elements have electrons, (1 to 14) in the f orbital, (0 to 1) in the d orbital of the penultimate energy level and in the outermost’s orbital.

There are two series in the f block corresponding to the filling up of 4f and 5f orbitals. The elements are 4f series of Ce to Lu and 5f series of Th to Lw. There are 14 elements filling up the ‘f’ orbital in each series.

F Block Elements

The position of F Block Elements in the Periodic Table: F block elements are placed separately at the bottom of the periodic table.

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