$($At. No. $Mo = 42, Pt = 78)$
where \(n=\) number of unpaired electron.
Number of unpaired \(e^{-} s\) and corresponding magnetic moments
\(1 \rightarrow 1.7\)
\(2 \rightarrow 2.8\)
\(3 \rightarrow 3.9\)
\(4 \rightarrow 4.9\)
\(5 \rightarrow 5.9\)
since \(B r^{-}\) is a weak feild ligand, so electrons in \(C o^{2+}\) will not pair up.
the complex has \(3\) unpaired electrons leaving it paramagnetic in nature.
$(1) $ $[Ag(NH_3)_2]^{+}$ - રેખીય
$ (2) $ $[MnCl^4]^{2-}$ - ચતુષ્ફલકીય
$(3) $ $[Cu(NH_3)_4]^{2+}$ - ચોરસ સમતલ
$(4) $ $[Ni(CN)_4]^{2-}$ - ચોરસ સમતલ