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An electron is an elementary particle which contains a single unit of negative elementary electric charge.


The electric charge on the electron is $-1.60217 \, 6634 \times 10^{−19}$ coulombs.

That is, a negative charge whose magnitude is the value of the elementary charge.


The mass of the electron is approximately $9.10938 \, 370 \, 15(28) \times 10^{-31}$ kilograms.


The actual size of the electron is still unknown.

The current best estimate is that its radius has an upper limit of the order of $10^{-22}$ metres.

Also see

  • Results about electrons can be found here.

Historical Note

The electron was discovered by Joseph John Thomson, who measured the Electron Charge to Mass Ratio in $1897$.

This happened as a result of several decades of work by many scientists.