**What is mass of electron?**

The invariant mass of an electron is approximately 9.109×10^{-31}** kilograms**, or 5.489×10−4 atomic mass units. On the basis of Einstein’s principle of mass–energy equivalence, this mass corresponds to a rest energy of 0.511 MeV. The ratio between the mass of a proton and that of an electron is about 1836.

**Mass of electron:-** Mass of electron is** 0.00055 a.m.u. **or** 9.1 x 10 ^{-31} kg **or

**0.91093826×10−300.91093826×10**

^{-30}kg.The **electron rest mass** (symbol: ** m_{e}**) is the mass of a stationary electron. It is one of the fundamental constants of physics and is also very important in chemistry because of its relation to the Avogadro constant. It has a value of about 9.109×10

^{−31}kilograms or about 5.486×10

^{−4}atomic mass units, equivalent to an energy of about 8.187×10

^{−14}joules or about 0.5110 MeV.

Values of m_{e} |
Units |
---|---|

9.10938356(11)×10^{−31} |
kg |

5.485799090(16)×10^{−4} |
u |

8.18710565(10)×10^{−14} |
J/c^{2} |

0.5109989461(13) | MeV/c^{2} |

Values of the energy of m_{e} |
Units |

8.18710565(10)×10^{−14} |
J |

0.5109989461(13) | MeV |