Multiple choice general knowledge science & technology If nucleus of two atoms contains equal number of NEUTRONS then they are known as __. isotopes isobars isotones nuclear isomers Reveal answer Fill a bubble to check yourself C Correct answer Explanation Isotones are atoms of different elements that have the same number of neutrons in their nuclei. This differs from isotopes (same protons, different neutrons) and isobars (same mass number but different proton/neutron counts).