In the Thomson's model of atom, which of the following statement are correct ?
(i) The mass of the atom is assumed to be uniformaly distributed over the atom.
(ii) The positive charge is assumed to be uniformaly distributed over the atom.
(iii) The electrons are uniformaly distributed in the positively charged sphere.
(iv) The electrons attract each other to stabilise tha atom.

Options

A. (i), (ii) and (iii)
B. (i) and (iii)
C. (i) and (iv)
D. (i), (iii) and (iv)

Explanation

To determine which statements about Thomson's model of the atom are correct, let's analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement (i): The mass of the atom is assumed to be uniformly distributed over the atom.**
- In Thomson's model, the atom is described as a positively charged sphere with electrons embedded within it. The mass of the atom is indeed considered to be uniformly distributed throughout this sphere.
- **Conclusion:** This statement is **correct**.

2. **Statement (ii): The positive charge is assumed to be uniformly distributed over the atom.**
- Thomson's model visualizes the atom as a "plum pudding," where the positive charge is spread uniformly throughout the sphere, with electrons scattered within it.
- **Conclusion:** This statement is **correct**.

3. **Statement (iii): The electrons are uniformly distributed in the positively charged sphere.**
- According to Thomson's model, the electrons are indeed embedded within the positively charged sphere, and they are considered to be uniformly distributed throughout this sphere.
- **Conclusion:** This statement is **correct**.

4. **Statement (iv): The electrons attract each other to stabilize the atom.**
- Thomson's model does not suggest that electrons attract each other; rather, it focuses on the balance of positive and negative charges to maintain the stability of the atom. There is no mention of electron-electron attraction in this model.
- **Conclusion:** This statement is **incorrect**.

### Final Answer:
- **Correct Statements:** (i), (ii), (iii)
- **Incorrect Statement:** (iv)