What is ground state?

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(N/A) The ground state of an atom is the lowest energy state of the system.
In the context of the Bohr model for a hydrogen atom,it corresponds to the state where the electron is in the innermost orbit,which is the orbit with the principal quantum number $n = 1$.
The energy of the electron in the ground state of a hydrogen atom is approximately $-13.6 \ eV$.

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The Bohr model of atoms:

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