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Question
What are inner transition elements?
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Solution
The inner transition elements have two series of elements.
- Lanthanoids
- Actinoids
1. Lanthanoid series consists of 14 elements from Cerium (58Ce) to Lutetium (71Lu) following Lanthanum (57La). These elements are characterised by the preferential filling of 4f orbitals.
2. Actinoids consist of 14 elements from Thorium (90Th) to Lawrencium (103Lr) following Actinium (89Ac). These elements are characterised by the preferential filling of 5f orbital.
The elements which in their elemental or ionic form have partly filled f-orbitals are called f-block elements.
As the f-orbitals lie inner to the penultimate shell, therefore these elements having partially filled f-orbitals, are also called inner transition elements.
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