In hydrogen like system the ratio of coul0mbian force and gravitational force between an electron and a proton is in the order of :

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​ F e ​ = r 2 kQ 1 ​ Q 2 ​ ​ = r 2 9 × 1 0 9 × 1.6 × 1 0 − 19 × 1.6 × 1 0 − 19 ​ F g ​ = r 2 Gm 1 ​ m 2 ​ ​ = r 2 6.67 × 1 0 − 11 × 9.1 × 1 0 − 31 × 1.6 × 1 0 − 27 ​ F g ​ F e ​ ​ ≅ 0.23 × 1 0 40 ≅ 2.3 × 1 0 39 Option (1) ​

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