The statement that describes the quantum mechanical model of the atom is duality of matter.
What is quantum mechanical model of an atom?
The quantum mechanical model of an atom is based on quantum theory, which states that matter has properties associated with waves (duality of matter).
Based on duality nature of matter, Erwin theorized that the behavior of electrons within atoms could be explained by treating them mathematically as matter waves.
This model developed by Erwin, is the basis of the modern understanding of the atom, and it is known as the quantum mechanical model of atom.
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