Which of the following are radioacitve?

Explanation

To determine which of the given elements (Cadmium, Indium, or Tin) are radioactive, we can follow these steps:

### Step 1: Understand the Criteria for Radioactivity
An element is considered radioactive if it has an odd number of protons or an odd number of neutrons, or both.

### Step 2: Analyze Cadmium
- **Protons in Cadmium (Cd)**: 48 (atomic number)
- **Neutrons in Cadmium**: 66 (mass number - atomic number = 114 - 48)

Both the number of protons (48) and the number of neutrons (66) are even. Therefore, Cadmium is **not radioactive**.

### Step 3: Analyze Indium
- **Protons in Indium (In)**: 49 (atomic number)
- **Neutrons in Indium**: 65 (mass number - atomic number = 114 - 49)

Here, the number of protons (49) is odd and the number of neutrons (65) is also odd. Therefore, Indium **is radioactive**.

### Step 4: Analyze Tin
- **Protons in Tin (Sn)**: 50 (atomic number)
- **Neutrons in Tin**: 64 (mass number - atomic number = 114 - 50)

Both the number of protons (50) and the number of neutrons (64) are even. Therefore, Tin is **not radioactive**.

### Conclusion
From the analysis:
- **Cadmium**: Not radioactive
- **Indium**: Radioactive
- **Tin**: Not radioactive

Thus, the only radioactive element among the given options is **Indium**.

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