Physics, 15.04.2021 22:40, grumpygirl0720

Each element has its own emission and absorption lines. What is the best explanation for this? Each element has a specific number of protons and neutrons.
Each element has a distinct number of electrons.
Each element has a unique set of physical characteristics.
Each element has unique energy levels.

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Each element has its own emission and absorption lines. What is the best explanation for this? Each...