Question

Of the following nuclides, the one most likely to decay by positron $\left({\beta }^{+}\right)$ emission is:

• A. ${}^{59}Cu$
• B. ${}^{63}Cu$
• C. ${}^{67}Cu$
• D. ${}^{68}Cu$

Answer 1

The correct option is A ${}^{59}Cu$

For ${}^{59}Cu$, n/p ratio is low so it will stablize by emitting positrons.