The element with highest boiling point in the following is

Options

A. Oxygen
B. Sulphur
C. Tellurium
D. Polonium

Explanation

To determine the element with the highest boiling point from the given options (Oxygen, Sulphur, Tellurium, and Polonium), we can follow these steps:

### Step 1: Identify the Elements and Their Atomic Numbers
- Oxygen (O) - Atomic number 8
- Sulphur (S) - Atomic number 16
- Selenium (Se) - Atomic number 34
- Tellurium (Te) - Atomic number 52
- Polonium (Po) - Atomic number 84

### Step 2: Understand the Group Trend
All the elements listed belong to Group 16 (the chalcogens). As we move down the group in the periodic table, the atomic size increases due to the addition of extra electron shells.

### Step 3: Analyze the Boiling Points
- The boiling point generally increases down a group in the periodic table due to the increase in Van der Waals forces (intermolecular forces) as the size of the atoms increases.
- The trend in boiling points for these elements is as follows:
- Oxygen (O): Lowest boiling point
- Sulphur (S): Higher than Oxygen
- Selenium (Se): Higher than Sulphur
- Tellurium (Te): Higher than Selenium
- Polonium (Po): Highest boiling point among these elements, but not included in the options.

### Step 4: Conclusion
Since we are only considering the options provided (Oxygen, Sulphur, Tellurium, and Polonium), Tellurium has the highest boiling point among these. Therefore, the correct answer is:

**C. Tellurium**

---