Interpretation:
This is to be explained how the
Concept introduction:
The quantum mechanical describe electron as matter wave model describes how to locate the electrons in various locations around the nucleus of an atom.

Answer to Problem 73A
The quantum mechanical is based on probability where electrons are located around the nucleus. It tells electron do not follow any circular path
Explanation of Solution
The quantum mechanical model of an atom does not explain exact any path the electron have around the nucleus, based on probability the electron will be located around the nucleus of an atom in various locations. It also tells about the energy
The quantum mechanical tells electron do not follow any circular path
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