The energy for one state of the Li2+ ion is -7.85 × 10 -19 J. What wavelength (nm) of light would need to be emitted to reach a state with an energy of -1.23 × 10 -18 J? Express answer in scientific notation.

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Chapter6: The Structure Of Atoms
Section6.7: One More Electron Property: Electron Spin
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The energy for one state of the Li2+ ion is -7.85 × 10 -19 J. What wavelength (nm) of light would need to be emitted to reach a state with an energy of -1.23 × 10 -18 J? Express answer in scientific notation.

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