An electron drops from the rm l shell to the rm k shell and
An electron drops from the {\rm L} shell to the {\rm K} shell and gives off an X-ray with a wavelength of 0.0205 {\rm nm}. What is the atomic number of this atom?
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an electron drops from the rm l shell to the rm k shell and gives off an x-ray with a wavelength of 00205 rm nm what is
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