Chemistry Question - Light

Yeah, just dumb typos because it was late when I posted the question.

And I probably should have posted the answer whenever I wrote the thread. Part B) is supposedly 3.68X10^-7 m, but looking through the notes I was able to find an example like it. Hurr durr.

I guess the answer from part A) is in J/mol, not just J, so you convert the energy into J for one atom, then solve for wavelength from the E = hc/lambda. Okay I have no idea, lol. When I did this, I didn't get 3.68E-7, but some other number. Then converting the ionization energy into J/atom and solving for lambda didn't work either, so I'm thoroughly confused.