What characterizes inorganic molecules?

Inorganic molecules are characterized primarily by their lack of carbon-hydrogen (C-H) bonds, which distinguishes them from organic molecules. While some inorganic molecules can indeed contain a small number of atoms, this characteristic does not universally define them. However, the answer that specifies inorganic molecules often encompassing a limited number of atoms is generally accurate, especially when compared to the vast complexity and size of many organic molecules, which can include large chains and rings of carbon atoms.

Inorganic molecules can also include salts, minerals, and metals, which may vary in size and complexity. It is essential to understand that while many inorganic compounds do contain hydrogen ions, this is not a defining feature across the board, as there are numerous inorganic substances that do not.

The assertion that inorganic molecules are exclusively gases at room temperature is inaccurate, as many exist in solid or liquid states, highlighting the diversity of inorganic compounds. Similarly, the presence of carbon and hydrogen is not a characteristic of inorganic molecules; rather, the focus is on the absence of the C-H bond. Thus, the statement regarding the small number of atoms is the most fitting to characterize inorganic molecules overall.