Wavelength of electromagnetic radiation

[babbagee]

Calculate the longest wavelength of electromagnetic radiation that could ionize an atom of each of the following elements:

a) Li; IE1=520.1 kJ/mol

can some one tell me the steps to do this problem.

thanks

[thunderfvck]

E=hv


v=\frac{c}{\lambda}

so...\lambda=\frac{hc}{E}

E = energy (IN JOULES, not kJ!!)
h = 6.626 * 10^-34 J*s
v = frequency (s^-1)
c = 3.00 * 10^8 m/s (speed of light)
\lambda = wavelength

[babbagee]

thanks,

the only thing that was confusing about this problem was the units. I used the exact equation but my units did not work out. I got an answer in m/atom then some one told me that the atom is ignored for some reason.