Question

which pair of atoms is most likely bonded together in a molecule that has resonance structures?
a. na and o
b. c and o
c. h and cl
d. f and s

Explanation:

• Resonance structures occur in covalent - bonded molecules with delocalized electrons.
• A. Na and O: Form an ionic bond (metal - non - metal), no resonance.
• B. C and O: Can form covalent bonds. For example, in \(CO_3^{2 -}\) (carbonate ion), there are resonance structures due to the delocalization of \(\pi\) electrons among the \(C - O\) bonds.
• C. H and Cl: Form a simple covalent bond (\(HCl\)) with no resonance.
• D. F and S: While they form covalent bonds, compounds like \(SF_6\) do not have the typical electron - delocalization for resonance as in some \(C - O\) containing species.

Answer:

B. C and O