A beautiful animation explaining what the Wave Function is, and WaveParticle Duality.
A wave function or wave function is a mathematical tool used in quantum mechanics to describe any physical system. It is a function from a space that maps the possible states of the system into the complex numbers.
The laws of quantum mechanics (i.e. the Schrödinger equation) describe how the wave function evolves over time.
The values of the wave function are probability amplitudes — complex numbers — the squares of the absolute values of which give the probability distribution that the system will be in any of the possible states.
It is commonly applied as a property of particles relating to their waveparticle duality, where it is denoted ψ(position,time) and where  ψ  2 is equal to the chance of finding the subject at a certain time and position.
For example, in an atom with a single electron, such as hydrogen or ionized helium, the wave function of the electron provides a complete description of how the electron behaves. It can be decomposed into a series of atomic orbitals which form a basis for the possible wave functions.
For atoms with more than one electron (or any system with multiple particles), the underlying space is the possible configurations of all the electrons and the wave function describes the probabilities of those configurations.
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