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.

first option, O-19 is radioactive; O-18 is not radioactive.

Explanation:

1) Radioactivity is the spontaneous emission of α (alpha) particles, β (beta) partilces, or γ (gamma) rays.

2) The above mentioned emissions come from the nucleus decay of isotopes.

3) The elements with unstable nuclei emitts radiaton spontaneously and are called radioactive.

4) Having been told that oxygen-18 has a stable nucleus, means that it does not emit radiation spontaneously, ergo it is not radioctive.

5) On the other hand, since oxygen-19 does not have a stable nucleus, it emitts ratiation spontaneoulsy and is called radioactive.

Oxygen-18 means that the mass number of this isotope is 18, and oxygen-19 means that this isotope has mass number 19. Mass number is the sum of the number of protons and neutrons.

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.