In the electron cloud model of the atom, an orbital is defined as the most probable location of an electron. Hence, option 3 is the correct answer.
An atomic orbital is a mathematical term in atomic theory and quantum mechanics that describes the position and wavelike behaviour of an electron in an atom.
An electron cloud is ​the region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital.
It is defined mathematically, describing a region with a high probability of containing electrons.
Hence, option 3 is the correct answer.
Learn more about the atomic orbital here:
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