Actinide series

Definition

The actinide series consists of 15 metallic elements from actinium (Ac) to lawrencium (Lr) in the periodic table. These elements are characterized by their filling of the 5f electron orbital.

5 Must Know Facts For Your Next Test

1. The actinide series includes both naturally occurring and synthetic elements.
2. Actinides are typically radioactive and have large atomic and ionic sizes.
3. Uranium and thorium are the most well-known actinides due to their use in nuclear reactors and weapons.
4. Many actinides exhibit multiple oxidation states, often +3, +4, and +5.
5. The chemistry of actinides is complex due to the involvement of f-electrons, leading to unique bonding and magnetic properties.

Review Questions

• What are the characteristic electron orbitals being filled in the actinide series?
• Which two actinide elements are most commonly used in nuclear applications?
• List at least two common oxidation states found in actinides.

Related terms

Lanthanide Series: A group of elements from lanthanum (La) to lutetium (Lu), often known as rare earth metals, characterized by filling of the 4f electron orbital.

Transuranium Elements: Elements with atomic numbers greater than uranium (92), all of which are synthetic and include some members of the actinide series.

Radioactivity: The process by which unstable atomic nuclei lose energy by emitting radiation; a common property among many actinides.