The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg?

✅ A. Traditional Chinese medicine

✅ A. carbon dioxide and water in clouds react to form carbonic acid

✅ C. Felix Hoffmann

✅ B. Wood

✅ C. 8 mins 20 sec

✅ C. Femur

✅ D. Cobalt

✅ D. Chip