A half-life of a radioactive substance is the amount of time needed for one half of _____ to decay into a stable isotope.
1 answer:
Answer: The molecules
Explanation:
A half-life describes the time it takes for half of the molecules to turn into a stable isotope
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I think the answer would be D
Answer:
B. Their location on the Baltic Sea
Explanation:
Invasions from other powers had been taking place in the Baltic Nations for a very long time due to it's location.
