system of particle fixed in space, each particle has total q. No. J, the mag. q. no. m.j., whic has (25+1) values -J (-J+1) - 4.Jr. energy. of a level. In a " In presence of m is given by.. E = field B. the m; 84B g. -7 hande g-factor find partition fem" for such an atom in mag. fice