Answer :
The electron cloud model is the modern model of the atom that contrasts the exact position of the electron. It is the currently accepted atomic model. Thus, option A is correct.
What is the electron-cloud model?
The electron-cloud model is currently accepted and used model that states about the moving electron cloud around the nucleus in an atom. It contrasts with the previous models.
The electron cloud gives the probable position of the electron rather than a fixed position. It was given by Erwin Schrodinger that showed electrons no longer move in a fixed orbital around the atom.
The position of the electron is determined based on the cloud where they are most likely to be present. The field with high probability is represented as a dense area.
Therefore, option A. electron-cloud model is a modern atomic model.
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