As before F = qE = 1.6X10

We must find the mass of the Cl ion. We know that Avogadro's number of
atoms has a mass of 35 gm or 0.035 kg.

Therefore the mass of one Cl atom = 0.035/6.02X10^{23} =
5.8X10^{-26} kg.

Weight = mg = 5.8X10^{-26} X 9.8 = 5.7X10^{-25} N

Ratio = F_{e}/F_{g} =
1.6X10^{-17}/5.7X10^{-25} = 2.8X10^{7}

Electrical forces are much stronger than gravitational forces. We are usually not aware of them because normal matter is electrically neutral.