Answer:
There are two subshells for n=2.
Explanation:
Principal quantum number (n)
It tell about the energy levels. It is designated by n.
For example,
If n =2
It means there are two energy level present.
Azimuthal quantum number (l)
The azimuthal quantum number describe the shape of orbitals. Its value for s, p, d, f... are 0, 1, 2, 3.
(n-1)
2-1 = 1
thus possible values of l = 0,1
it means principle quantum is 2 and subshells are s and p..
