What is the ratio of electrostatic force to gravitational force between an electron and a proton in an atom (approximately)?

1.8 x 1039  1.2 x 1039  2.4 x 1039  6.5 x 1039

2.4 x 1039

Memory Point !! The ratio of electrostatic force to gravitational force between an electron and a proton in an atom is about 2.4 x 1039 .