Answer:
50
Explanation:
1. Half of 100, or 1/2 x 100, is 50.
2. Starting with 100 grams of carbon-14 in a substance, how long would it take until only 50 grams of the parent isotope remained?
Answer: 50 grams is half of 100 grams of the parent isotope. Therefore, the carbon-14 has completed one half-life of 5,730 years.
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