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I'm given the isotope sodium 22 (which is positron emitter) and I'm stuck with calculating the minimum energy that a proton needs to convert into a neutron and a positron.

It got to do with $E=MC^2$ but with which masses do I calculate now specifically?

My first calculation was $22na - (22ne +electron)$ and my second one was $(11*mp)+(11mn)-(22na)$ but now I am confused - what did I calculate with my first attempt and what with the second one? Is one of them correct for my task or both wrong?

Notice: When I mention an element in an equation it means I'm using the atomic mass of it (atomic mass of 22 na, 22ne, electron, and so on)

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    $\begingroup$ Search term: mass excess $\endgroup$
    – rob ♦
    Commented Mar 4, 2019 at 11:48

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Well, turns out after figuring it out both attempts were wrong

In this specific case it has nothing to do with the isotope it's just "mass of proton - (mass of neutron + mass of electron)" and with that one need to calculate the energy coming from that mass defect - pretty simple

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