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Energy Levels of the Hydrogen Atom
•In the ground state the electron is in the n = 1 shell (1s orbital)
Energy
n = 1 (1s)
n = 2 (2s, 2p)
n = 3 (3s, 3p, 3d)
n = 4 (4s, 4p, 4d, 4f)
•Photons of the correct energies can promote the electron to higher shells.
•The excited atom can return to the ground state by emitting a photon of the same energy.
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