Answer
The mass of fluorine atom would be: 3.16 x $10^{-26}$ kg.
Work Step by Step
To find the mass of fluorine atom, we multiply the mass-to-charge ration with the charge of the ion:
m of fluorine atom = 1.97 X $10^{-7}$ $\frac{kg}{C}$ x 1.602 X $10^{-19}$ C
m of fluorine atom = 3.156 X $10^{-26}$ kg
m of fluorine atom = 3.16 X $10^{-26}$ kg
