Number of energy levels in Hydrogen

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How many energy levels are there in Hydrogen?

E = -E0n2

It is important to know that the electron in a Hydrogen atom can only have certain energies. These energies are called the Hydrogen’s “energy levels”. Not too many people know that the different energy levels of a Hydrogen atom are given by the equation:

E = – E0

where E0 = 13.6 eV (1 eV = 1.602×10-19 Joules) and n = 1,2,3… and so on so that the ground state has energy E1= -13.6 eV and the second energy level (the first excited state) has energy E2 = -13.6/4 eV = -3.4 eV.


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