Final answer:
The ideal neutron-to-proton ratio for stable atoms with lower atomic numbers is approximately 1:1, corresponding to option B (1:0).
Step-by-step explanation:
The question asks about the ideal neutron-to-proton ratio in stable atoms. Among atoms with lower atomic numbers, this ratio is approximately 1:1, which corresponds to option B (1:0). However, as the atomic number increases, this ratio gradually increases, reaching approximately 1.5:1 for the heaviest stable elements. Notably, in nuclear reactions, the conservation of both protons and neutrons is a crucial aspect, meaning the mass numbers and atomic numbers must remain balanced in the reactions.