Which nuclides are more abundant to nature...?

Question

n each of the following pairs, which nuclides would you expect to be the more abundant in nature

a) 19/9 F or 18/9 F

b)80/34 Se or 81/34 Se

c) Iron-56 or iron-57

d) tin-118 or antimony-118

Justify the choices

Thank you for the help

10 points

Answer 1

the one whose mass most closely approximates the average mass of that element on the chart is more likely to have a stable ratio of protons to neutrons

a) 19/9 F

b)80/34 Se

c) Iron-56

d) tin-118

you can check your work @

http://ie.lbl.gov/education/isotopes.htm