9 (.10956)

Electron rest mass from Table of Physical constants

“The electron rest mass, symbolized m e , is the mass of an electron as measured when its speed is zero relative to an observer. The electron has extremely small mass  – it’s almost 2000 times less massive than the proton — at approximately 9.10956 x 10 -31 kilogram (kg) or 9.10956 x 10 -28 gram (g). Every known electron at rest has the same mass as every other known electron at rest.”

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