Which of the following group -14 elements is a radioactive element?

Options

A. Flerovium
B. Germanium
C. Nihonium
D. Gallium

Answer

To determine which of the group-14 elements is a radioactive element, we can follow these steps:

### Step 1: Identify Group-14 Elements
Group-14 elements in the periodic table include:
- Carbon (C)
- Silicon (Si)
- Germanium (Ge)
- Tin (Sn)
- Lead (Pb)
- Flerovium (Fl)

### Step 2: Check the Radioactivity of Each Element
Next, we need to check which of these elements are radioactive:
- **Carbon (C)**: Stable isotopes, not radioactive.
- **Silicon (Si)**: Stable isotopes, not radioactive.
- **Germanium (Ge)**: Stable isotopes, not radioactive.
- **Tin (Sn)**: Stable isotopes, not radioactive.
- **Lead (Pb)**: Mostly stable, but has some radioactive isotopes (e.g., Pb-210).
- **Flerovium (Fl)**: This is a synthetic element and is known to be radioactive.

### Step 3: Conclusion
Among the group-14 elements, **Flerovium (Fl)** is the only radioactive element.

### Final Answer
The radioactive element in group-14 is **Flerovium (Fl)**.

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