What was the basis of the earliest attempts made for classification and grouping of elements ?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Context**: The classification of elements has evolved over time, with early attempts focusing on observable characteristics.

2. **Physical Properties**: The earliest attempts at classifying elements were primarily based on their physical properties. These properties include:
- **Malleability**: The ability of a substance to be deformed or shaped without breaking.
- **Ductility**: The ability of a material to be stretched into a wire.
- **Flexibility**: The capacity of a material to bend without breaking.
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