The masses of an electron, a proton and a neutron respectively will be in the ratio

Step-by-step solution

We know that the mass of electron is 9 . 109 × 10 - 31 whereas the mass of proton is 1 . 672 × 10 - 27 and the mass of neutron is 1 . 674 × 10 - 27 Thus, taking the ratio of the masses of electron, proton and neutron ⇒   e : p : n ⇒     9 . 109 × 10 - 31   kg   :   1 . 672 × 10 - 27   kg   :   1 . 674 × 10 - 27   kg ⇒     1 :   1836 . 15 :   1838 . 68