Chemistry - Coordination Chemistry Question with Solution | TestHub

On the basis of 18-electron rule, identify the first-row transition metals ${\mathrm{M}}_{\mathrm{a}}$ and ${\mathrm{M}}_{\mathrm{b}}$. Write sum of their atomic number

(I) ${\left[{\left({\eta }^5-{\mathrm{C}}_5{\mathrm{H}}_5\right)}_2{\mathrm{M}}_{\mathrm{a}}\right]}^{+}$

(II) $\mathrm{H}\left[{\mathrm{M}}_{\mathrm{b}}(\mathrm{CO}{)}_5\right]$