Configuration \(e ^4 t _2^3: m =4\)
Number of unpaired electrons \(=3\)
So, answer \(=7\)
$(I)\, [(Ph_3P)_2PdCl_2PdCl_2]$ $(II)\,[NiBrCl(en)]$
$(III)\, Na_4 [Fe(CN)_5 NOS]$ $(IV)\, Cr(CO)_3(NO)_2$
$(I)\,-\,(II)\,-\,,(III)\,-\,(IV)$
(પરમાણુ ક્રમાંક : $Ni = 28$)