Question

Principal, azimuthal and magnetic quantum numbers are respectively related to:

• A. shape, size and orientation
• B. size, shape and orientation
• C. Orientation, size and shape
• D. size, spin and shape

Answer 1

The correct option is B size, shape and orientation

Principal (n), azimuthal (l) and magnetic quantum (m) numbers are respectively related to size, shape, and orientation.
1) The principal quantum number is related to the size and energy of the main shell.
‘n’ has positive integer values of 1, 2, 3,...
As ‘n’ increases, the shells become larger and the electrons in those shells are farther from the nucleus.

2) Each value of ‘l’ is related to the shape of a particular sub-shell in the space around the nucleus.

3) The magnetic quantum number $\left(m_l\right)$ has integer values between -l and l, including zero. Thus for a certain value of l, there are (2l +1) integer values of $\left(m_l\right)$ as follows:
-l, (-l+1) . . ., –1, 0, 1, . . . (+l - 1), +l
These values describe the orientation of the orbital in space relative to the other orbitals in the atom.