Answer:
2
Step-by-step explanation:
What are quantum numbers?
The set of numbers used to describe the position and energy of the electron in an atom are called quantum numbers.
They are four quantum numbers,
They are :-
1) Principal Quantum Number
2)Angular Quantum Number
3)Magnetic Quantum Number
4)Spin Quantum Number
Given in question,
n = 4, m = - 2
When
When I = 0 , m = 0
When I = 1 , m = - 1, 0, 1
When I = 2 m = - 2, - 1, 0, 1, 2
Hence there are two subshells