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An electron is a particle which has such a tiny mass that it moves perceptibly wave-like, instead of following trajectories as we would expect from a moving object.
In the beginning of the 20th century scientists discovered that all particles behave like waves. This wavelike behaviour is most obvious in objects with a very, very tiny mass, like electrons, neutrons and photons.
It was discovered that electrons don't always move in well defined trajectories. Instead, they seem to spread around a probability wave through space. The probability of detecting an electron in a particular location depends on the amplitude of this wave.
Depending on the circumstances, this probability wave can can exhibit interference and diffraction (like any wave), resulting in distinctly wave-like behaviour.
All objects (including objects as large as virusses, humans and planets) behave in this wave-like manner. But the probability wave of such a heavy object has such a very, very small wavelength, that its motion can be approximated accurately by trajectories. We are lucky that this is the case, because the wave description of motion is much more difficult to calculate that the trajectory description.
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What is the difference between a wave and a particle?
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