which of these nuclides is most likely to be radioactive?



a)    21383Bi
b)   20981Tl
c)    10343Mo
d)   24998Cf
e)    24997Bk
f)      plutonium-239.
g)    potassium-41
h)    polonium-209
i)       hydrogen -3
j)       helium -3

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