- #1

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## Homework Statement

Find the ##Q## value for electron capture of ##^{196}Au##.

## Homework Equations

##Q_\epsilon = [m(^AX)-m(^AX')]c^2-B_n##

## The Attempt at a Solution

How do I know if I have an ##K##- or ##L##-shell for the electron?

Assuming I have an ##K## shell taking ##B_n = \; ^{196m1}Au## from this table,

https://en.wikipedia.org/wiki/Isotopes_of_gold

;I get the correct answer but I don't understand why it couldn't just as well been an ##L##-shell?