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Question

What is the charge and mass of an electron?


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Solution

Electron:

The negatively charged particle that revolves in the shells of atom is known as an electron.

Charge on electron:

  1. The charge on the electron was determined by oil drop experiment.
  2. The absolute charge on electron is 1 coulomb of negative charge.
  3. This suggests that an electron has 1 unit of negative charge.
  4. Thus, the relative charge on an electron is -1.

Mass of electron:

  1. The mass of electron is 11840 times the mass of a Hydrogen (H) atom.
  2. The mass of hydrogen atom is 1u.
  3. Thus, the relative mass of electron is 11840u.
  4. The absolute mass of electron is 1.9×10-28g which is very small and considered as negligible.

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