The mass of a H-atm is less than the sun f the masses of a proton and electron. Why is this?

Explanation

According to mass energy equivalence established by Einstein, `E = mc^(2)`. If B represents binding energy of hydrogen atom `(=13.6 eV)`, the equivalent mass of the energy `= B//c^(2)`.
Hence, mass of a H-atom `= m_(p) + m_(e) - B//c^(2)`.
It is less than sum of the masses of a porton and an electron.