alternating sum
1.As indicated by structural analysis, the backbone of 13 is a one-dimensional linear chain which is comprised of alternating [Nb_2O_3F_8]~4- anions and Cd(C_3H_4N_2)_2~2+ Bond valence sum displays that 01, 03 and F3 have much more negative charge, so they act as bridge ligands.
2.Having alternating currents of two different frequencies that are combined to produce two new frequencies, the sum and difference of the original frequencies, either of which may be used in radio or television receivers by proper tuning or filtering.
