Transcription: You've got three tools here to use in your investigation. On the left there's an energy level diagram and this displays the seven lowest energy levels for the atom or ion that you're exploring. You can use the scroll bar to move down through the energy range or up as far as zero electron volts. And you can use the arrows on the scale control to compress the energy scale or to enlarge it. When you move the pointer over the energy level diagram the arrow turns into a grey disc and when this disc is positioned over an energy level it turns white and the value of the energy is displayed. If you cl ...
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