Abstract: Ethane, hydrazine, and hydrogen peroxide are three structurally similar substances composed of the elements from the same period with hydrogen, respectively. However, their stability significantly decreases in a sequential manner, and their stable conformations are also dissimilar. These differences have not been explained adequately in the current textbooks. This article provides a possible explanation for the variation in stability among these substances by analyzing their n-σ^* hyperconjugation. Additionally, it elucidates the absence of anti-conformation in hydrazine and hydrogen peroxide. The hyperconjugation theory is extended to illustrate and to discuss stability and stable conformation of inorganic compounds.

Key words: Ethane, Hydrazine, Hydrogen peroxide, Stability, Conformation, Hyperconjugation