Chemistry / Chem 0822 · Atom · ~20 seconds
The Principal Quantum Number, n
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The principal quantum number, n, is a positive integer setting an orbital's shell, governing electron energy and distance from the nucleus.
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An electron in the n = 1 shell sits closer to the nucleus and at lower energy than one in n = 3.
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A higher n marks a higher-energy, more distant shell — it says nothing about orbital shape.