The number of significant figures in $50000.020\times {10}^{-3}$ is___

Given, number = $50000.020\times {10}^{-3}$

Value of exponent part are not considered as the significant figure.

The rightmost zeros are significant when there is a decimal point in the number.

Significant figure = 8

Therefore, significant figure in $50000.020\times {10}^{-3}$ is 8.