Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order.
(i) Rutherford's atomic model (ii) Thomson's atomic model
(iii) Bohr's atomic model

Options

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

Explanation

To arrange the atomic models in chronological order, we need to identify the sequence in which each model was proposed. Here’s the step-by-step solution:

### Step 1: Identify the First Model
The first atomic model was proposed by **J.J. Thomson** in 1897. This model is known as the **plum pudding model**. It suggested that atoms are composed of electrons scattered within a "soup" of positive charge.

**Hint:** Look for the earliest model that introduced the concept of electrons.

### Step 2: Identify the Second Model
The second model was proposed by **Ernest Rutherford** in 1911. This model emerged from his gold foil experiment, which led to the discovery of the atomic nucleus. Rutherford's model depicted the atom as having a dense, positively charged nucleus surrounded by electrons.

**Hint:** Consider which model introduced the idea of a nucleus in the atom.

### Step 3: Identify the Third Model
The third model was proposed by **Niels Bohr** in 1913. Bohr's model built upon Rutherford's findings and introduced the concept of quantized orbits for electrons, where electrons travel in specific paths or shells around the nucleus.

**Hint:** Think about the model that introduced the concept of electron orbits.

### Final Arrangement
Based on the above steps, the chronological order of the atomic models is:
1. **Thomson's atomic model** (1897)
2. **Rutherford's atomic model** (1911)
3. **Bohr's atomic model** (1913)

### Summary of the Order:
- (ii) Thomson's atomic model
- (i) Rutherford's atomic model
- (iii) Bohr's atomic model

**Final Answer:** (ii), (i), (iii)