Answer:
Among the options provided, NaCl (sodium chloride) could be the product of a chemical reaction where all the atoms have a stable configuration. In NaCl, sodium (Na) donates one electron to chlorine (Cl), forming an ionic bond. This results in both sodium and chlorine having a stable electron configuration, fulfilling the octet rule for stability. The other molecules listed (PH₄, KCl₂, and SiO) do not represent stable configurations for all the atoms involved.