What is the position of lanthanide and actinide series in the periodic table ?

Explanation

To determine the position of the lanthanide and actinide series in the periodic table, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Lanthanides and Actinides**:
- The lanthanide series consists of 15 elements that follow lanthanum (La, atomic number 57) in the periodic table.
- The actinide series consists of 15 elements that follow actinium (Ac, atomic number 89).

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