The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is _____.

$$\begin{gathered} \mathrm{Chromate} \mathrm{ion} \\ {\left({\mathrm{CrO}}_4\right)}^2 \end{gathered}$$$\to$

 

No. of bonds = 7

$\mathrm{Dichromate} \mathrm{ion}$ $\to$

${\left({\mathrm{Cr}}_2{\mathrm{O}}_7\right)}^{2-}$

No. of bonds = 12

$\Rightarrow$Total number of Cr and O bonds is 19.