When adding electricity and heat energy to elements it causes their electrons to get bumped up to higher energy levels. When the electrons go back down to their original energy levels they give off the excess energy as light. The amount of energy and the jumps the electrons make determine the color of light and the emission spectrum given off.
Take a look at Lucy Walter's Chemistry students hard at work ....
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29: Senior Movie Night @6:30
30: End of Qtr 1
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5: Stress Happens Wrkhp (LYSB) @7
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