Answer:
mℓ
Explanation:
To solve this question one has to have in mind the values the quantum number can assume given a principal quantum number n.
ℓ angular quantum numbe,can have the values 0, 1, 2,3 to n-1
and they correspond to the shape of the orbital in and have the symbol
0 ⇒ s orbital
1 ⇒ p orbial
2 ⇒ d orbital
for d orbitals ( l= 2 ) we can have five orientations in space since mℓ can have the value which range from - ℓ to + ℓ:
for l= 2
mℓ = -2, -1, 0, 1, 2
which corresponds to the five orientations possible for d orbitals:
dz², dxy, dxz, dyz, dx²-y²
Hence it follows the two orbitals in our question differ in their quantum number mℓ