What have you learned about radioactive dating? Check all that apply.Unstable atoms release particles.The radioactive decay of an element occurs at a constant rate.A half-life is half of the lifetime of a radioactive element.At one half-life, half of the original unstable element has decayed.All elements are radioactive.
Answer
A
Unstable atoms release particles.
B
The radioactive decay of an element occurs at a constant rate.
C
A half-life is half of the lifetime of a radioactive element.
D
At one half-life, half of the original unstable element has decayed.
E
All elements are radioactive.
Explanation
Radioactive decay is a spontaneous process: unstable atoms emit particles or other radiation, and each radioactive isotope has a constant decay rate. A half-life is the time it takes for half of the original unstable atoms to decay, so choice D is also correct. It is not half of an element’s total lifetime, and not all elements are radioactive.
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