Chemistry, 09.12.2020 05:00, asialoggin21

How long does it take for 87.5 % of each isotope to decay? (The isotopes are below)
Krypton-73= 27 seconds
Krypton-74= 11.5 minutes
Krypton-76= 14.8 hours
Krypton-81= 2.1 x 10^5 years

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How long does it take for 87.5 % of each isotope to decay? (The isotopes are below)
Krypton-...