Nature of Atoms

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Homework Statement


(a) What is the minimum energy (in electron volts) that is required to remove the electron from the ground state of an ionized atom (Z=2)? (b) What is the ionization energy for this ion?


Homework Equations


After doing what I got the answer for part (b)... but I don't know what part (a) requires. I thought this number would be 13.6 eV, but it's not. What exactly is part (a) asking?


The Attempt at a Solution



I used the equation E= -13.6*(Z^2/n^2). I plugged in 2 for Z and 1 for n.
 

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Astronuc
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