![]() Start with the most stable electron configuration.It corresponds with a state with maximal S and L. It is relatively easy to calculate the term symbol for the ground state of an atom. When it is odd, the parity of the term symbol is indicated by a superscript letter "o", otherwise it is omitted:Īlternatively, parity may be indicated with a subscript letter "g" or "u", standing for gerade (even in German) or ungerade (odd): In fact, only electrons in odd orbitals contribute to the total parity: an odd number of electrons in odd orbitals (those with an odd l such as in p, f.) will make an odd term symbol, while an even number of electrons in odd orbitals will make an even term symbol, irrespective of the number of electrons in even orbitals. Where l i is the orbital quantum number for each electron. The parity of a term symbol is calculated as 3 Term symbols for an electron configuration.In this case, J can be 1, 2, or 3, so 3 + 5 + 7 = 15. The sum of (2 J+1) for all levels in the same term equals (2 S+1)(2 L+1). ![]()
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