Which of the following properties does not increase from helium to xenon?

Options

A. Boiling point
B. Atomic radius
C. Rate of diffusion through glass
D. None of these

Answer

To solve the question of which property does not increase from helium to xenon, we can analyze each of the given properties step by step.

### Step 1: Understand the Elements
- Helium (He) and Xenon (Xe) are both noble gases located in Group 18 of the periodic table.
- They have complete valence electron shells, which contributes to their chemical stability.

### Step 2: Analyze Each Property
1. **Boiling Point**:
- As we move from helium to xenon, the boiling point increases.
- This is due to the increase in atomic mass and the resulting increase in van der Waals forces (dispersion forces) between the atoms.

2. **Atomic Radius**:
- The atomic radius also increases from helium to xenon.
- This is because the number of electron shells increases as we move down the group.

3. **Rate of Diffusion**:
- The rate of diffusion is inversely proportional to the square root of the molar mass (Graham's law).
- As we move from helium to xenon, the molar mass increases significantly, leading to a decrease in the rate of diffusion.

4. **Glass**:
- The term "glass" in this context is unclear, but if it refers to the ability of gases to pass through glass or the interaction with glass, it is not a standard property that would increase or decrease in a clear manner like the others.

### Step 3: Conclusion
- Among the properties analyzed, the **rate of diffusion** is the only property that does not increase from helium to xenon; instead, it decreases due to the increase in molar mass.

### Final Answer
The property that does not increase from helium to xenon is the **rate of diffusion**.

---