Question

radioactive
element
were
Five hundred million atoms of an artificial
prepared in the
laboratory. This element has its half-life
calculate the
number of along
(in millions) of this element who have not
disting disintegrated after & and an-hours?
& hour​

Answer 1

Explanation:

Element Most Stable Isotope Half-life of Most Stable Isotope

Actinium Ac-227 21.77 years

Thorium Th-229 7.54 x 104 years

Protactinium Pa-231 3.28 x 104 years

Uranium U-236 2.34 x 107 years

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