Part A The half-life of bromine-74 is 25 min. How much of a 4.0 mg sample is still active after 75 min?
O 0.25 mg
2.0 mg
4.0 mg
0.50 mg
O 1.0 mg
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periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

the answer to your question is c