Answer
Please see the work below.
Work Step by Step
a) The energy of an electron in a hydrogen atom and in a many-electron atom is determined by the principal quantum number n.
b) The size of an orbital is determined by the principal quantum number n.
c) The shape of an orbital is determined by Angular momentum or Azimuthal quantum number $l$.
d) The orientation is determined by Magnetic quantum number $m_{l}$
