Question

which choice is not an example of a molecule?
○ h₂s
○ koh
○ mn
○ o₃

Explanation:

A molecule is formed by the combination of two or more atoms. $H_2S$ is a compound - molecule with hydrogen and sulfur atoms. $KOH$ is an ionic compound made of ions but can be considered a molecule in some contexts. $O_3$ is a molecule composed of three oxygen atoms. $Mn$ is the chemical symbol for the element manganese, which is a single - atom entity and not a molecule.

Answer:

Mn