Final answer:
Typically, elements like noble gases (e.g., helium, neon, argon) and active metals are NOT found in organic molecules, as they generally do not form stable covalent bonds with carbon.
Step-by-step explanation:
The elements commonly found in organic molecules include carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur, and sometimes additional elements such as halogens. However, elements that are not typically found bonding in organic molecules are less reactive noble gases, alkaline earth metals, and active metals (like sodium or potassium under normal biological conditions).
In answering the question of which elements would NOT be found in an organic molecule: While there could be exceptions under specific and unusual circumstances, the elements from the noble gas group, such as helium (He), neon (Ne), or argon (Ar), generally do not form bonds with carbon due to their inert nature and complete valence electron shells. Therefore, you would not expect to find these elements within organic compounds in living organisms.