| The members of the first of these blocks are called the lanthanide elements, and those in the second are the actinides. |
| Like the lanthanide elements, the actinides have very similar chemical properties. |
| The improvement of the separation of actinides from lanthanides was a major achievement in the area of partitioning. |
| Second, he emphasizes the economic value of actinides and fission products in the spent fuel but does not acknowledge either economic or proliferation concerns. |
| Local magnetism occurs in rare-earth metals and the actinides due to the incomplete filling of electrons in the inner atomic shells. |
| The elements that make up this family are also known as the actinides, after the first member of the family. |
