Essential Chemistry for IGCSE - Atoms, Elements And Compounds (Section 4 - No. 20)
What does the half-life of a radioactive isotope represent?
The time it takes for the isotope to completely decay.
The time it takes for half of the isotope to decay.
The time it takes for the isotope to double in mass.
The time it takes for the isotope to become stable.
Explanation
The half-life is the time required for half of the radioactive atoms in a sample to decay.
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