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220. 32.00 grams of isotope X decay to form 2.00 grams of X after 10.0 days.   What is the half-life of isotope X?
       
A. 1.25 days The half-life is the time necessary for half of the atoms to decay.

32.00 g      time = 0 days
16.00 g      time = 1 half-life
8.00 g        time = 2 half-lives
4.00 g        time = 3 half-lives
2.00 g        time = 4 half-lives         10.0 days/4half-lives  =  2.50 days

The Correct Answer is B. 

B. 2.50 days
C. 5.00 days
D. 10.0 days