What is the atomic number of the next halogen if discovered ?

Options

A. 85
B. 117
C. 167
D. 104

Explanation

To determine the atomic number of the next halogen if discovered, we can follow these steps:

### Step 1: Identify the Halogen Group
The halogens are located in Group 17 of the periodic table. The known halogens include:
- Fluorine (F) - Atomic number 9
- Chlorine (Cl) - Atomic number 17
- Bromine (Br) - Atomic number 35
- Iodine (I) - Atomic number 53
- Astatine (At) - Atomic number 85

### Step 2: Determine the Next Halogen
The next halogen after Astatine (At) would be the next element in Group 17.

### Step 3: Find the Atomic Number of the Next Halogen
The atomic number of Astatine is 85. The next period in the periodic table is the 7th period, which can accommodate 32 elements.

### Step 4: Calculate the Atomic Number of the Next Halogen
To find the atomic number of the next halogen, we add 32 to the atomic number of Astatine (85):
\[ 85 + 32 = 117 \]

### Conclusion
Therefore, the atomic number of the next halogen, if discovered, would be 117. This element is known as Tennessine (Ts).

### Summary
The atomic number of the next halogen is 117.

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