Unstable isotopes are radioactive isotopes, can disintegrate and emit radiations.
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When an isotope is unstable, it is said to be radioactive.
False. When an unstable isotope decays, the resulting daughter isotope may or may not be stable. Some daughter isotopes are stable, while others may still be radioactive and undergo further decay.
Not all isotopes are unstable. But now more than 3 000 unstable isotopes are known, artificial or natural.
It isn't really an ELEMENT that is unstable, but an ISOTOPE. That means that in general, for the same element, some atoms will decay, and some will not - the difference being the number of neutrons in the nucleus.
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