Answer:
i think is o helium, He........
Answer:
See below
Explanation:
.75 = 1/2^(40/h)
log .75 / ( log 1/2) = 40 / h
<u>h = half life = 96.37683 min</u>
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Hmm the answer is 2.454
No explanation needed it’s just 2.454
