Why hydrogen is used for comparing  proton & electron

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• Hydrogen is the atom of lowest mass that is, 1u.
• The mass of a proton is taken as 1 unit and its charge as +1.
• The mass of a proton was calculated as being equal to the mass of an atom of hydrogen, i.e. 1·672 x 10^-24 g. The relative mass of a proton is 1u.
• If we compare the mass of a proton with that of an electron, then the mass of a proton is 1840 times that of an electron. 
• The absolute mass of a proton is 1.6 x 10^-24 gram.

 

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