Why do transition elements show similarities along the horizontal period ?

Explanation

To answer the question "Why do transition elements show similarities along the horizontal period?", we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding Transition Elements**:
- Transition elements are found in the d-block of the periodic table. They include elements from groups 3 to 12.

2. **Electronic Configuration**:
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