Question

Define F block elements in the modern periodic table.

Answer 1

• The modern periodic table is an arrangement of all the elements known by their increasing atomic number and recurring chemical properties.
• It is a tabular display of 118 chemical elements which consists of horizontal rows called periods and vertical columns are called groups.

F block elements:

• f block elements are found outside at the bottom of the periodic table.
• The name f- blocks because the last electron enters into the f-orbital of the anti-penultimate shell.
• F block elements are divided into two series, namely lanthanides and actinoids.
• The two series of inner transition elements that are 4f and 5f series are known as lanthanides and actinides respectively.
• The lanthanides are generally considered to be elements with atomic numbers 58-71 (lanthanum to lutetium).
• The actinides are generally considered to be elements with atomic numbers 89-103 (actinium to lawrencium).