Radioactive element (t½=2.5×10⁵yrs). Time for 1/6 original mass to remain?
University of Ilorin CHM101 2022 past question
- 4.87×10⁵yrs
- 6.47×10⁵yrs
- 8.47×10⁵yrs
- 7.48×10⁵yrs
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