Which of lanthanides is man-made element?

Explanation

To determine which lanthanide is a man-made element, we can follow these steps:

### Step 1: Understand the Lanthanide Series
The lanthanide series consists of 15 elements, starting from Cerium (atomic number 58) to Lutetium (atomic number 71). These elements are known for their similar properties and are often found together in nature.

**Hint:** Remember that the lanthanide series includes elements with atomic numbers from 58 to 71.

### Step 2: Identify Man-Made Elements
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