O-18 an isotope of oxygen has a stable nucleus. O-19another isotope of oxygen does not stable nucleus
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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.
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.
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