The number of possible spatial orientations of an electron in an atom is given by its

spin quantum number

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orbital angular momentum

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magnetic quantum number

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Azimuthal quantum number

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Solution

The correct option is B magnetic quantum number
Principal quantum number represents the name, size and energy of the shell to which the electron belongs.
Azimuthal quantum number describes the spatial distribution of electron cloud and angular momentum.(ie. shape of orbital)
Magnetic quantum number describes the orientation or distribution of electron cloud.
Spin quantum number represents the direction of electron spin around its own axis.

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3

= \frac{n . h}{2 π}

Question 21

Which of the following statements concerning the quantum numbers are correct ?

(a) The angular momentum quantum number determines the three-dimensional shape of the orbital

(b) The principal quantum number determines the orientation and energy of the orbital

(d). Spin quantum number of an electron determines the orientation of the spin of electron relative to the chosen axis.

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