what are f block elements
f block elements are the elements in which the last electron enters the f-orbital of the penultimate energy level. These elements are placed separately at the bottom of the modern periodic table and are divided into two series: lanthanides and actinides.
The f block elements are also known as inner transition elements because their electrons fill the inner f-orbitals.
The two series of f block elements are:
| Series | Atomic Number Range | Example Elements |
|---|---|---|
| Lanthanides | 58–71 | Cerium, Neodymium |
| Actinides | 90–103 | Uranium, Thorium |
Lanthanides are called rare earth elements and are mostly found naturally in the Earth’s crust. Actinides include many radioactive elements, some of which are artificially produced in laboratories.
General Electronic Configuration:
(n−2)f¹–¹⁴ (n−1)d⁰–¹ ns²
Characteristics of f Block Elements
Most are metals
Many show variable oxidation states
Actinides are mostly radioactive
They have high melting and boiling points
Many are good conductors of heat and electricity
Uses of f Block Elements
Uranium is used in nuclear reactors
Neodymium is used in strong magnets
Thorium is used in nuclear energy research
Lanthanides are used in cameras, lasers, and electronic devices
In conclusion, f block elements are inner transition metals in which electrons enter f-orbitals. They include lanthanides and actinides and are important in nuclear science, electronics, and industrial applications.