Equation for ionization energy

[annemarielawrence]

which equation would you use to find the ionization energy or the energy needed to add an electron? Would it be particle in a box?

[Tylina Guo 1K]

I believe there is an equation known as the Bohr equation that would be used for this calculation although I don't think we will be tested on this or expected to know it.

[Ananya Sridharan]

I think we don't need to know the exact equation. Just know the periodic trends like ionization energy increases as you go across a period and decreases down a group.