How do you calculate the energy of an electron in the ground state of a hydrogen atom?

A simple expression for the energy of an electron in the hydrogen atom is:

E=−13.6/n2 where the energy is in electron volts

n is the principle quantum number.

So for an electron in n=1:

E=−13.6eV

To convert to joules you can x this by 1.6×10−19

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