What does actinide mean?
noun
A series of radioactive, metallic elements with atomic numbers ranging from 89 to 103, following the lanthanides in the periodic table. They are characterized by the filling of the 5f electron shell.
Example
"The actinides are a group of highly radioactive elements that are difficult to work with due to their intense radioactivity."
Definition generated by AI and curated by RJS Tech Solutions LLP.