Which statement correctly distinguishes isotope status from radioactivity?
Only radioactive atoms count as isotopes.
Every isotope is radioactive.
Some isotopes are stable and others are radioactive.✓Ճիշտ պատասխան
Radioactivity depends only on electron count.
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Isotopes vary in nuclear stability, so some are stable while others undergo radioactive change. Saying that every isotope is radioactive wrongly treats the word isotope as a synonym for radioactive isotope.