Wave–particle duality is the concept that every elementary particle or quantic entity may be partly described in terms not only of particles, but also of waves. It expresses the inability of the classical concepts "particle" or "wave" to fully describe the behavior of quantum-scale objects.
Shows that waves and particles must work together to create light.
Wave Particle Duality Explained
Electron particles are in waves and when the waves spread out, the electron can only be in one place at one time, while the waves are everywhere
To determine where it will be physicists use formulas to pinpoint the exact location.