Definition of quantum number in English:

quantum number

Line breaks: quan|tum num¦ber


  • A number which occurs in the theoretical expression for the value of some quantized property of a subatomic particle, atom, or molecule and can only have certain integral or half-integral values.
    More example sentences
    • Each quantum number describes the value of a property of the electron.
    • The principal quantum number tells us how far from the nucleus a certain electron is, i.e. what level it occupies, the greater is n, the farther it is from the nucleus.
    • Similar orbital schemes may be constructed for larger values of the principal quantum number.

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