The name given to the labels that describe various characteristics of elementary particles, atoms and molecules. Examples include the charge and spin of a particle.

Set of numbers used to describe an electron's position. Back to .

are used in quantum mechanics to describe electron wavefunction. Principle quantum number (values: 1, 2, 3...), angular momentum quantum number l or L (values: 0 (=s), 1 (=p), 2 (=d)...), magnetic quantum number m or M, spin quantum number s or S (values: +1/2, -1/2). See also term symbols. A vibrational quantum number (nu) (values: 0, 1, 2, 3... ) is used in the description of the energy of molecular vibrational levels.

four numbers that describe the "address" of an electron in an atom according to a mathematical model. The numbers reveal the electron's energy level, orbital shape and orientation, and the direction of its spin.

Set of numbers used to specify any orbital in a given atom. Consist of Primary, Secondary, Azimuthal, and Spin numbers. See those related terms. Back to .

Numbers that describe the energies of electrons in atoms; derived from quantum mechanical treatment. Chemistry Terminology R