According to Mendeleev's periodic law physical and chemical properties are function of

Options

A. Option 1. Atomic number
B. Option 2. Atomic weight
C. Option 3. Atomic volume
D. Option 4. Number of neutrons

Answer

To answer the question regarding Mendeleev's periodic law, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Mendeleev's Periodic Law**:
- Mendeleev's periodic law states that the physical and chemical properties of elements are periodic functions of their atomic weights. This means that when elements are arranged in order of increasing atomic weight, elements with similar properties appear at regular intervals.

2. **Arrangement of Elements**:
- Mendeleev arranged the elements in a table format where elements were placed in rows (periods) and columns (groups) based on their atomic weights. The elements in the same column share similar chemical and physical properties.

3. **Identifying the Key Concept**:
- The key concept here is that the properties of elements are not random but follow a periodic trend based on their atomic weights. This periodicity allows for the prediction of properties of undiscovered elements.

4. **Conclusion**:
- Therefore, according to Mendeleev's periodic law, the physical and chemical properties of elements are a function of their atomic weights.

### Final Answer:
According to Mendeleev's periodic law, physical and chemical properties are a function of atomic weight.

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