Yes, electrons have a mass of 9.1094 X 10−31 kg.
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because the electrons plus the nuetrons equal the mass
depends on the electrons
electrons are the same as protons
If you know the mass of one mole of those atoms (the mass number listed on the periodic table), then you divide that number by Avogadro's constant: 6.022x10^23 which gives you the mass of one single atom
The electron cloud has such a small mass because that's where all the electrons are! Electrons are fundamental particles having a mass of only 9.109 X 10-31 kg. To put that into perspective, a proton has a mass of over 1,800 times that of the electron.