Mass Of One Electron

Mass Of One Electron In Grams

An electron is a subatomic particle with a negative electric charge represented using the symbol e−. The electron rest mass is the mass of the stationary electron, denoted by m_e. The mass of the electron is one of the primary chemical constant as it deals with the Avogadro constant. The value of the mass of an electron is equal to 9.1x10^-31 kilograms.

E A stable elementary particle in the lepton class having a negative electric charge of 1 elementary unit (about 1.602 × 10 -19 coulombs) and a mass of about 9.11 × 10 -28 grams. Electron, lightest stable subatomic particle known. It carries a negative charge of 1.602176634 × 10 −19 coulomb, which is considered the basic unit of electric charge. The rest mass of the electron is 9. × 10 −31 kg, which is only 1/1,836 the mass of a proton.

An electron is a subatomic particle with a negative electric charge represented using the symbol e−. The electron rest mass is the mass of the stationary electron, denoted by m_e. The mass of the electron is one of the primary chemical constant as it deals with the Avogadro constant. The value of the mass of an electron is equal to 9.1x10^-31 kilograms.

Electrons have a relative mass of 9.1 x 10^-31 kilograms, or 0.51 megaelectron volts. They are a lot smaller than protons and neutrons; and, an electron is roughly 0.054 percent of the mass of one neutron. To calculate the mass of a single atom, first look up the atomic mass of carbon from the periodic table. This number, 12.01, is the mass in grams of one mole of carbon. One mole of carbon is 6.022 x 10 23 atoms of carbon (Avogadro's number).

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Mass Of One Electron In Amu

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What are the exact relative masses of protons, neutrons and electrons?

Protons and neutrons have nearly the same mass while electrons are much less massive. If we assume that a neutron has a mass of 1, then the relative masses are:

Neutron = 1
Proton = 0.99862349
Electron = 0.00054386734

Said another way, protons are only about 99.86% as massive as neutrons while electrons are only about 0.054% as massive as neutrons. While relative masses are nice if you want to compare protons, neutrons and electrons to one another, it doesn't tell you what the actual masses of these particles are. In kilograms, the masses are:

Neutron = 1.6749286*10^-27 kg
Proton = 1.6726231*10^-27 kg
Electron = 9.1093897*10^-31 kg

Mass Amu Of An Electron

There is another unit, called an electron volt (eV), that scientists use when talking about small things like protons, neutrons and electrons. An electron volt is actually a measurement of energy, but scientists can get away with using it to measure mass since mass and energy are related by Einstein's famous equation, E = mc². So, in terms of MeV (Megaelectron volts, 1 MeV = 1,000,000 eV), the masses are:

Neutron = 939.56563 MeV
Proton = 938.27231 MeV
Electron = 0.51099906 MeV

Author:

Steve Gagnon, Science Education Specialist (Other answers by Steve Gagnon)

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