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• In Bohr’s model, the quantum number n determines the radius of  the electron’s orbit and is directly related to the atom’s energy.

• The lower the value of n, the smaller is the radius of the orbit and  the lower is the energy level of the atom.

• When the electron is in the n = 1 orbit, the atom is in its lowest  (first) energy level, called the ground state.

• The second energy level (second stationary state) and all  higher levels are called excited states.

• A hydrogen atom in the 2nd energy level can return to the ground  state by emitting a photon of a particular frequency:

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