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The mass of the electron is 9,109 383 56(11)×10e-31 kg.
The uncertainty is +/-11 for the last two decimals.

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Relative mass of electron?

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Why is the mass of electron difficult to find?

The mass of an electron is difficult to find because of the Heisenberg Uncertainty Principle. Either a particle's position or direction can be known, and the more precisely one is measured, the other is subject to more possible variation.


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What is the velocity of an electron with a mass of 9.11 x 10-31 kg at a position with an uncertainty of 5x10-10 m?

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