Probability cloud is a picture of the electron suggested by the quantum-mechanical model of the hydrogen atom.
What is probability cloud?
"Electrons are quite spread out around the nucleus, which is why this area is referred to as an electron cloud."
What is Quantum Mechanical Model of hydrogen atom?
"In 1926, Austrian physicist Erwin Schrödinger (1887-1961) used the wave-particle duality of the electron to develop and solve a complex mathematical equation that accurately described the behaviour of the electron in a hydrogen atom.
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