Question

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

Explanation:

A molecule is a group of two or more atoms held together by chemical bonds. $O_3$ (ozone) is a molecule made of three oxygen atoms. $KOH$ (potassium hydroxide) is an ionic - compound but also considered a molecule in some contexts as it exists as a discrete entity with atoms bonded. $H_2S$ (hydrogen sulfide) is a covalent molecule with two hydrogen and one sulfur atom. $Mn$ (manganese) is an element, a single atom and not a molecule.

Answer:

Mn