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An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.
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How many energy levels contain electrons in an atom of zirconium (zr)?
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Given the following balanced equation: 4 Al + 302-> 2 Al2O3
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