Answer: the wave-particle duality of electrons. Quantum mechanics is a fundamental theory in physics that describes the behavior of particles at the atomic and subatomic levels. One of its key principles is the concept of wave-particle duality, which states that all particles, including electrons, can exhibit both wave-like and particle-like properties depending on the experimental setup. This duality is a fundamental concept in quantum mechanics and is not limited to electrons but applies to all particles at the quantum level.
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