[પરમાણુ ક્રમાંક : $Zn = 30, Sc = 21, $$Ti = 22, Cr = 24$]
\(C r^{3}+=[A r] 3 d^{3}, 4 s^{0}\)
since, this complex has three unpaired electrons, excitation of electrons is possible and thus, it is expected that this complex will absorb visible light.
$(1)$ ટ્રાન્સ $-[Co(NH_3)_4 Cl_2]^+$
$(2)$ સિસ $-[Co(NH_3)_2 (en)_2]^{3+}$
$(3)$ ટ્રાન્સ $-[Co(NH_3)_2(en)_2]^{3+}$
$(4)$ $NiCl^{2-}_4$
$(5)$ $TiF^{2-}_6$
$(6)\, CoF^{3-}_6$
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