Answer
See explanation below.
Work Step by Step
This answer can be found in the chapter 24 reading.
a. Formation of 52Mn through positron emission
52 Fe 26 --> 52 Mn 25 +0b 1
b. Formation of polonium-215 through a decay
219 Rn 86 --> 215 Po 84 + 4 He 2
c. Formation of 81Kr through electron capture
81 Rb 37 + 0 e -1 --> 81 Kr 36