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Which two atoms below have the same number of neutrons?
(top:15, bottom:8) O, (top:16, bottom:8) O, (top:20, bottom:9) F, (top:20, bottom:10) Ne, (top:22, bottom:11) Na
a) (top:15, bottom:8) O and (top:16, bottom:8) O
b) (top:16, bottom:8) O and (top:22, bottom:11) Na
c) (top:20, bottom:9) F and (top:22, bottom:11) Na
d) (top:20, bottom:9) F and (top:22, bottom:11) Na
e) (top:20, bottom:10) Ne and (top:22, bottom:11) Na

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