sentences:  The superscript three (read as "triplet") indicates that the multiplicity "2S+1" = 3, so that the total spin "S" = 1.This spin is due to two unpaired electrons, as a result of Hund's rule which favors the single filling of degenerate orbitals.The triplet consists of three states with spin components +1, 0 and –1 along the direction of the total orbital angular momentum, which is also 1 as indicated by the letter P. The total angular momentum quantum number J can vary from L+S = 2 to L–S = 0 in integer steps, so that J = 2, 1 or 0.