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This coefficient (3s) refers to the thirds-orbital in the electron cloud around the positive core. And if you're wondering what an s-orbital is: that is a "shell" or "peel" in which the max 2 electrons are most likely to be, according to some heavy calculations

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12y ago
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Q: What does the coefficient 3 refer to in 1s2 2s2 2p6 3s2 3p4?
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