The mass of an electron is a fundamental constant of nature and it is very small. On the other hand, the mass of a hydrogen atom is relatively large compared to that of an electron. Therefore, the ratio of the mass of an electron to that of a hydrogen atom is a very important quantity in physics.


The mass of an electron is approximately 9.11 x 10^-31 kg, while the mass of a hydrogen atom is approximately 1.67 x 10^-27 kg. Therefore, the ratio of the mass of an electron to that of a hydrogen atom is:

9.11 x 10^-31 kg / 1.67 x 10^-27 kg

Simplifying this expression, we get:

5.45 x 10^-4

Therefore, the ratio of the mass of an electron to that of a hydrogen atom is approximately 5.45 x 10^-4.


The ratio of the mass of an electron to that of a hydrogen atom is an important quantity in physics. It is used in a variety of calculations, such as:

- The calculation of the mass of other particles in terms of the mass of an electron or a hydrogen atom.
- The calculation of the energy levels of atoms and molecules.
- The calculation of the wavelengths of electromagnetic radiation emitted or absorbed by atoms and molecules.


In conclusion, the ratio of the mass of an electron to that of a hydrogen atom is approximately 5.45 x 10^-4. This ratio is an important quantity in physics and is used in a variety of calculations.

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