Inner Transition Elements
| Also Known As | F-block elements, f-block metals, lanthanides and actinides, rare earth elements (lanthanides) |
|---|
What is Inner Transition Elements?
Inner transition elements are the elements in which the last electron enters the f-orbital (f-block elements). They are placed in two rows at the bottom of the periodic table: the lanthanides (Period 6, 4f subshell) from cerium (Ce, Z=58) to lutetium (Lu, Z=71), and the actinides (Period 7, 5f subshell) from thorium (Th, Z=90) to lawrencium (Lr, Z=103). They show similar chemical properties within each series.
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Inner transition elements are the elements in which the last electron enters the f-orbital (f-block elements). They are placed in two rows at the bottom of the periodic table: the lanthanides (Period 6, 4f subshell) from cerium (Ce, Z=58) to lutetium (Lu, Z=71), and the actinides (Period 7, 5f subshell) from thorium (Th, Z=90) to lawrencium (Lr, Z=103). They show similar chemical properties within each series.
Lanthanides: permanent magnets (Nd₂Fe₁₄B), phosphors (Eu, Tb in LEDs/displays), catalysts, optical fibers (Er-doped). Actinides: nuclear fuel (U-235, Pu-239), nuclear weapons, radiation therapy (Ra, Ac). Cerium (Ce) in catalytic converters. Gadolinium (Gd) as MRI contrast agent.
Lanthanides: low acute toxicity; some are mild irritants. Actinides: highly radioactive — radiation hazards (alpha, beta, gamma, neutron). Heavy element toxicity (uranium nephrotoxic). Nuclear criticality risk for fissile actinides (U-235, Pu-239). Strict regulatory controls for actinide handling.