Question

In each pair of isotopes shown, indicate which one you would expect to be radioactive. (a). 20 10 Ne, 17 10 Ne; (b) 40 20 Ca, 45 20 Ca; (c) 95 42 Mo and 92 43 Tc, (d) 195 80 Hg and 196 80 Hg. (e) 209 83 Bi and 242 96 Cm.

Answer 1

there are a couple short rules that we can use to judge the relative stability of different isotopes. Do you know any?

Answer 2

no sorry :(

Answer 3

usually even mass numbers are more stable than odd numbers.

usually equal numbers of protons and neutrons are more stable than unequal numbers

start with those, and see if that narrows down your options

Answer 4

Thank you :)