Solving Nature of Atoms Homework: Part (a) ionization energy Z=2

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The discussion focuses on calculating the ionization energy for an ionized atom with atomic number Z=2, specifically helium. For part (a), the minimum energy required to remove the electron from the ground state is sought, while part (b) involves determining the ionization energy. The user initially believed the answer for part (a) was 13.6 eV, which is incorrect as this value applies to hydrogen. The correct approach involves using the formula E = -13.6 * (Z^2/n^2), where Z=2 and n=1, indicating that the ionization energy for helium needs to be calculated accordingly. Understanding the distinction between ionization and excitation is crucial for solving these types of problems.
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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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