Electrons are tiny particles which behave like clouds. We think of them as clouds of probability. The thickness of the cloud decides how likely it is that you will find the electron at that point.
Electrons carry something called a negative electric charge.
Electrons are important because, together with protons and neutrons, they make the atoms from which you and I are made.
Electrons feel the electromagnetic, weak, and gravitational forces but not the strong nuclear force.
The electron has an antimatter particle called the positron. This has the same mass but carries a positive charge. If it meets an electron, both are annihilated in a burst of radiation.
To get an idea of the size of electrons, visit Soccearth.
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