Which of the following is likely to be least st

To determine which of the given compounds is likely to be the least stable, we need to consider their atomic structures and bonding characteristics.

Analyzing the Options

• Ca₄₀: Calcium typically forms stable compounds, but in such a high quantity, it may lead to instability due to excessive electron repulsion.
• Mn₅₅: Manganese can exhibit various oxidation states, but a large cluster like this could be unstable due to its complex electron configuration.
• Sn₁₁₉: Tin is generally stable, but a large number of atoms might lead to instability in certain configurations.
• Al₃₀: Aluminum tends to form stable structures, but a large aggregation could also introduce instability.

Conclusion on Stability

Among these, Mn₅₅ is likely to be the least stable due to the complexity of manganese's oxidation states and the potential for instability in such a large cluster. Therefore, option (B) is the best choice for the least stable compound.