Multiple Choice
Which element has a most common isotope that contains 5 neutrons?
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4. Atoms and Elements
Isotopes
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Which type of isotope undergoes radioactive decay?
A
An isotope with the same number of protons and neutrons
B
A radioactive (unstable) isotope
C
An isotope that has no neutrons
D
A stable isotope
Verified step by step guidance1
Understand that isotopes are variants of the same element that differ in the number of neutrons in their nuclei.
Recognize that stability in an isotope depends on the balance between protons and neutrons; isotopes with an unstable ratio tend to undergo radioactive decay.
Identify that a radioactive isotope, also called a radioisotope, is an unstable isotope that spontaneously emits radiation to reach a more stable state.
Note that isotopes with the same number of protons and neutrons are not necessarily stable; stability depends on the overall nuclear forces and energy balance.
Conclude that the type of isotope that undergoes radioactive decay is the radioactive (unstable) isotope.
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