Principal quantum number
Number assigned to each electron in an atom / From Wikipedia, the free encyclopedia
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In quantum mechanics, the principal quantum number (symbolized n) is one of four quantum numbers assigned to each electron in an atom to describe that electron's state. Its values are natural numbers (from one) making it a discrete variable.
Apart from the principal quantum number, the other quantum numbers for bound electrons are the azimuthal quantum number ā, the magnetic quantum number ml, and the spin quantum number s.