Hydrogen cyanide oxide (HCNO) is a unique molecule with significant relevance in astrochemistry and atmospheric chemistry. Composed of hydrogen, carbon, nitrogen, and oxygen, HCNO has a linear atomic structure with hybridization and molecular bonding that determine its properties. Its molecular weight, shape, polarity, molecular geometry, and bond lengths are all influenced by the arrangement and interactions of its atomic components. Understanding the Lewis structure of HCNO provides insights into its electronic structure, bonding, and behavior in various environments.