which among the following does not at all show the tendency to form peroxides?

Options

A. Li
B. Mg
C. Be
D. Ba

Answer

To determine which element among the given options does not show the tendency to form peroxides, we can analyze each option based on their chemical properties.

### Step-by-Step Solution:

1. **Understanding Peroxide Formation**:
- Peroxides are compounds that contain an O-O bond (the peroxide linkage). Certain alkali and alkaline earth metals can form peroxides under specific conditions.

2. **Analyzing the Options**:
- **Lithium (Li)**: Lithium can form lithium peroxide (Li2O2) when it reacts with oxygen.
- **Magnesium (Mg)**: Magnesium can also form magnesium peroxide (MgO2) under certain conditions.
- **Beryllium (Be)**: Beryllium does not form peroxides due to its small ionic size and high polarizing power, which leads to the formation of stable oxides instead.
- **Barium (Ba)**: Barium can form barium peroxide (BaO2) when it reacts with oxygen.

3. **Conclusion**:
- Among the options given, Beryllium (Be) is the only element that does not show any tendency to form peroxides.

### Final Answer:
- The element that does not at all show the tendency to form peroxides is **Beryllium (Be)**.