身近な科学
Why do neon signs glow?
Hydrogen emits discrete spectral lines because electrons change between quantized energy states.
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短い答え
Hydrogen emits discrete spectral lines because electrons change between quantized energy states.
本当は何が起きている？
Sodium has 11 electrons; its outer 3s electron helps explain why sodium readily forms Na+.
役立つイメージ
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An electric discharge excites atoms. When electrons return to lower-energy states, atoms emit photons at characteristic wavelengths, producing a recognizable spectrum.