Answer
$^{11}_{6}C$, $^{13}_{7}N$, $^{15}_{8}O$, $^{18}_{9}F$
Work Step by Step
$^{11}_{6}C$, $^{13}_{7}N$, $^{15}_{8}O$, $^{18}_{9}F$ can emit positron
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