Question

The half-life for a 100-gram sample of radioactive element x is 5 days. How much of element x remains after 10 days have passed?.

Answer 1

25 gm

Step-by-step explanation:

Start with 100 gm ..... after ONE half life there will be 50 gm left

after a second half life (5 + 5 days) there will be 25 gm left