What is the meaning of 1st excited state of hydrogen atom?
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Electrons occupy shells CHARACTERISED by the principal quantum number. ✔✔✔✔✔✔✔✔✔✔ The lowest energy shell ( ) is the ground-state. ✔✔✔✔✔✔✔✔✔✔ If you have a ground state HYDROGENATOM, the the first EXCITATION energy is the distance to the lowest unoccupied orbital i.e. it is the lowest energy that can excite an ELECTRONIC transition. ✔✔✔✔✔✔✔✔✔✔