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## Homework Statement

An absorption line at 6966 eV is known to come from a hydrogen-like ion. Calculate the likely atomic number of the element and hence identify it. (The ionization energy of hydrogen is 13.6eV.)

## Homework Equations

not sure

## The Attempt at a Solution

Using E=(13.6Z^2)/n^2 eV where n=1 => 6966=13.6Z^2

So Z=22.6.

I thought I should get a precise whole number and neither Z=22or 23 are hydrogen-like ions, so I think I must have done this wrong.