Actinides

Definition

Actinides are a series of 15 metallic elements in the periodic table from actinium (Ac) to lawrencium (Lr), with atomic numbers 89 to 103. They are known for being radioactive and having significant applications in nuclear energy.

5 Must Know Facts For Your Next Test

1. Actinides are located in the f-block of the periodic table.
2. All actinides are radioactive, and some are naturally occurring while others are synthetic.
3. The most well-known actinide is uranium (U), which is used as fuel in nuclear reactors.
4. Many actinides have multiple oxidation states, allowing them to form various compounds.
5. Actinides can be hazardous due to their radioactivity, requiring special handling and storage.

Review Questions

• What is the range of atomic numbers for the actinide series?
• Why is uranium an important element among the actinides?
• What block of the periodic table do actinides belong to?

Related terms

Lanthanides:

A group of 15 metallic elements from lanthanum (La) to lutetium (Lu) in the periodic table, often found together with actinides in f-block chemistry.

Radioactivity: The spontaneous emission of particles or radiation from unstable atomic nuclei, a characteristic feature of all actinide elements.

Transuranium Elements: Elements with atomic numbers greater than that of uranium (92), many of which belong to the actinide series and are synthesized artificially.