Which one of the following statements best explains why a neon sign does not emit visible light after it is turned off?
None of the neon atoms are in the n = 2 state.
All of the neon atoms have principle quantum number n = 0.
Most of the neon atoms are in the ground state.
Only some of the neon atoms have returned to the n = 1 state.
All of the neon atoms are ionized.
most of the neon atoms are in the ground state
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