Hello Dr.Bob, could you please help me with this problem:

Question

Which of the following nuclides are most likely to decay via beta decay?
a)200 78 Pt b)192 78 Pt c)188 78 Pt
d)196 78 Pt

Answer 1

According to this table it appears to me that 78Pt200 is subject to beta decay while 192 and 196 are stable and 188 is electron capture.
https://en.wikipedia.org/wiki/Isotopes_of_platinum