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  4. The quantum number which is responsible for the size of electron cloud is

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Q. The quantum number which is responsible for the size of electron cloud is

AMUAMU 2002

Solution:

Principal quantum number $(n)$ determines the size and main energy level or shell. Azimuthal or angular quantum number $(l)$ gives the sub-shell or sub-level and also determines the shape of the orbitals.
Magnetic quantum number $(m)$ refers to the different orientations of the orbitals in space. Spin quantum number $(s)$ describes the : pin orientation of the electron.