When the hydrogen atom makes the transition from the n=2 to the n=1 energy level, it emits a photon. this photon can be absorbed by to a singly ionized helium atom (he+) in its second energy level (ninitial=2), causing it to move to a higher energy level. to what final energy level number nfinal can the photon promote the helium ion?
note that he+ has two protons in its nucleus and a single electron.
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When the hydrogen atom makes the transition from the n=2 to the n=1 energy level, it emits a photon....
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