Which one of the following statements is TRUE?*1 pointAll isotopes of an element are radioactiveAll unstable isotopes of an element are radioactiveAll isotopes of an element, apart from the most abundant one, are radioactiveAll radioisotopes decay by emitting alpha particles
Question
Which one of the following statements is TRUE?*1 pointAll isotopes of an element are radioactiveAll unstable isotopes of an element are radioactiveAll isotopes of an element, apart from the most abundant one, are radioactiveAll radioisotopes decay by emitting alpha particles
Solution
The true statement is: "All unstable isotopes of an element are radioactive".
Here's why:
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Not all isotopes of an element are radioactive. Radioactivity is a property of unstable isotopes, not all isotopes.
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While it is true that all unstable isotopes of an element are radioactive (that's what makes them unstable), not all isotopes are unstable.
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The abundance of an isotope has nothing to do with its radioactivity. An isotope's stability is determined by the balance of protons and neutrons in its nucleus, not its abundance.
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Not all radioisotopes decay by emitting alpha particles. Some decay by emitting beta particles, gamma rays, or by other processes.
Similar Questions
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A radioactive element...A...has an unstable nucleus that will become stable if the element reacts with another element to form a compound.B...has an unstable nucleus that will become stable if more electrons are lost.C...has an unstable nucleus that will become stable if more electrons are added.D...has an unstable nucleus that will decay to produce a different element.
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