Mass Of Electron, Proton, Neutron|Charge Of Electron And Proton

Mass of electron: The electron mass (m_e) is the mass of a stationary electron, also known as the rest mass of the electron. The value of mass of an electron is, 9.109 383 7015 x 10-31 kg, 0.00054858 amu.

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Mass of Electron

The electron mass determines a number of observed effects in atomic physics, so its very imporatant to find out the most accurate value of electron mass.

The mass of the electron was determined directly from combining two measurements.

The mass-to-charge ratio of the electron
The charge of the electron

The mass-to-charge ratio of the electron was first estimated by Arthur Schuster in 1890 .

in 1897, J. J. Thomson showed that cathode rays consist of streams of particles later called electrons, and made more precise measurements of their mass-to-charge ratio using a cathode ray tube.

The charge of the electron was determined by Robert A. Millikan in his oil drop experiment in 1909.

Mass of Electron,Proton and neutron is given. Another detailed post : Electron Mass – Mass of electron, Charge, Speed, & value of electron can be read here

mass-of-electron-in-gm-kg-amu-eV — mass of electron in gm,kg, amu, & eV

Electron Mass and uncertainty

electron mass	m_e
Numerical value	9.109 383 7015 x 10-31 kg
Standard uncertainty	0.000 000 0028 x 10-31 kg
Relative standard uncertainty	3.0 x 10-10
Concise form	9.109 383 7015(28) x 10-31 kg

Mass of Proton

Proton mass m_p = 1.672621898×10_⁻²⁷ Kg. Mass of proton is higher than the mass of electron.

Proton mass	Value
Mass of the proton in kg	1.672621898(21)×10⁻²⁷ kg
Mass of the proton in grams	1.672621898(21)×10⁻²⁴ g
Mass of proton in amu	1.007276466879(91) u
Proton mass in MeV	938.2720813(58) MeV/c²

Mass of Neutron

Mass of Neutron is , m_N 1.674927471 x 10^-27kg.

Neutron mass	Value
Mass of neutron in kg	1.674927471(21)×10⁻²⁷ kg
Mass of neutron in grams	1.674927471(21)×10⁻²⁴ kg
Mass of neutron in amu	1.00866491588(49) amu
Mass of neutron in MeV	939.5654133(58) MeV/c²