I believe that it would be Al1N1.
The answer to this question would be: 3.125%
Half-life is the time needed for a radioactive molecule to decay half of its mass. In this case, the strontium-89 is already gone past 5 half lives. Then, the percentage of the mass left after 5 half-lives should be:
100%*(1/2^5)= 100%/32=3..125%
Question:
How many neutrons are there in 186W
Answer:
112
hope it helps (^^)
# Cary on learning
