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**1. What is the maximum wavelength of light required to fully ionised Uranium to U92+, i.e.**

strip it of all electrons and leaving a bare nucleus? For simplicity, only consider direct

ionisation and neglect non-linear effects.

strip it of all electrons and leaving a bare nucleus? For simplicity, only consider direct

ionisation and neglect non-linear effects.

Attempt at solution

Ok, so the electron structure of the atom is 2,8,18,32,21,9,2. Ionization will be the energy required to remove an electron that is the least tightly bound to the atom. In order to completely ionize the atom do I calculate the energy required to ionize each electron at their respective energy levels? I am a bit confused as to how to tackle the problem.

Thanks