The element of group 17 whose half life is in milliseconds only is

Options

A. 1. Ts
B. 2. Te
C. 3. At
D. 4. Og

Answer

To solve the question regarding which element of group 17 has a half-life in milliseconds, we can follow these steps:

### Step 1: Identify Group 17 Elements
Group 17 of the periodic table consists of the halogens. The elements in this group are:
- Fluorine (F)
- Chlorine (Cl)
- Bromine (Br)
- Iodine (I)
- Astatine (At)
- Tennessine (Ts)

### Step 2: Determine the Radioactive Elements
Among the halogens, we need to identify which ones are radioactive. The radioactive elements in group 17 are:
- Astatine (At)
- Tennessine (Ts)

### Step 3: Compare Half-Lives
Next, we need to look at the half-lives of these radioactive elements:
- Astatine (At) has a half-life of approximately 8 hours.
- Tennessine (Ts) has a half-life of about 80 milliseconds.

### Step 4: Conclusion
Since the question asks for the element of group 17 whose half-life is in milliseconds, the answer is Tennessine (Ts).

### Final Answer
The element of group 17 whose half-life is in milliseconds only is Tennessine (Ts).

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