Which postulate of the Dalton’s atomic theory was modified after the discovery of isotopes ?

Explanation

To answer the question, "Which postulate of Dalton’s atomic theory was modified after the discovery of isotopes?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Dalton's Atomic Theory**:
- Dalton's atomic theory proposed that all atoms of a given element are identical in mass and properties. This means that atoms of the same element have the same size, shape, mass, and chemical properties.

2. **Discovery of Isotopes**:
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