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	Shells and Energy Levels
	Look at this little electron. It's in its ground state in the shell closest to the atomic nucleus. If we want it to jump to a higher shell we must add the same amount of energy as the difference between its current shell and the shell we want it to jump to. Try it yourself. The energy gun at the bottom of the screen can be set to different wavelengths (energies) by turning the wheel. To get the electron to jump to the shell you desire, just set the gun to the right energy and fire away!

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