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What is the mass of an electron?
What is the invariant mass of an electron?
What is the mass of an electron compared to a proton?
Do neutrons and protons have the same mass?
In particle physics, the electron mass (symbol: m e) is the mass of a stationary electron, also known as the invariant mass of the electron. It is one of the fundamental constants of physics.
Learn about the electron mass, a fundamental constant that is the mass of a stationary electron. Find out the value of electron mass in different units and the formula to calculate the rest mass of electron using Rydberg constant.
- 7 min
The invariant mass of an electron is approximately 9.109 × 10 −31 kg, or 5.489 × 10 −4 Da. Due to mass–energy equivalence, this corresponds to a rest energy of 0.511 MeV (8.19 × 10 −14 J). The ratio between the mass of a proton and that of an electron is about 1836.
Jun 7, 2024 · Learn about the electron, one of the three basic subatomic particles that make up atoms. Find out its mass, charge, spin, and how it is classified as a fermion and a lepton.
- The Editors of Encyclopaedia Britannica
Learn the rest mass of an electron and how it was calculated from two historical experiments: cathode ray tube and oil drop. Find out the relative mass of an electron and the difference between rest mass and normal mass.
The electron has mass m_e = 9.1095\times 10^{-28}{\rm\ g}=9.1095\times 10^{-31}{\rm\ kg} = 0.51100 {\rm\ MeV}/c^2, where c is the speed of light. See also: Electron, Electron Charge
The mass of an electron is only about 1/2000 the mass of a proton or neutron, so electrons contribute virtually nothing to the total mass of an atom. Electrons have an electric charge of \(-1\), which is equal but opposite to the charge of a proton, which is \(+1\).
