O-18, an isotope of oxygen, has a stable nucleus. O-19, another isotope of oxygen, does not have a stable nucleus. Based on this information, which statement is correct? O-19 is radioactive; O-18 is not radioactive.
O-19 has a mass defect; O-18 does not have a mass defect.
O-19 has a nuclear binding energy; O-18 does not have a nuclear binding energy.
O-19 has more neutrons than protons; O-18 has equal numbers of neutrons and protons.