. The half life periods of four isotopes are given below
a. 7.6 years
b. 4000 years
c. 6000 years
d. 3.2 x 1010
Best Answer
a. 7.6 years
Related questions
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a. 7.6 years
b. 4000 years
c. 6000 years
d. 3.2 x 1010
a. 7.6 years