A diatomic molecule has a dipole moment of 1.2 D. If the bond distance is $1.0A^0,1/x$  of an electronic charge exists on each atom, the value of x is ______

$\mathbf{Partial}\mathbf{charge}\mathbf{=}\frac{\mathrm{Dipolemoment}}{\mathbf{Bond}\mathbf{distance}}$

$=\frac{1.2\times {10}^{-18}\mathrm{esu}-\mathrm{cm}}{1.0\times {10}^{-8}\mathrm{cm}}=1.2\times {10}^{-10}\mathrm{esu}$

The fraction of an electronic charge is 

$\frac{1}{x}\times 4.8\times {10}^{-10}=1.2\times {10}^{-10}$

$x=\frac{4.8\times {10}^{-10}}{1.2\times {10}^{-10}}=4$