How many electrons in an atom can have the following quantum
numbers?
n = 5, l = 2, ml = -2, ms = +1/2

The answer for the following question is explained.

Therefore the  number of electrons present with the values n = 5, l = 2, m = -2, s = +1/2 is one(1).

Explanation:

Here;

n represents the principal quantum number

l represents the Azimuthal quantum number

m represents magnetic quantum number

s represents spin quantum number

n = 5,

l = 2,

m = -2,

s = +1/2

Here, it implies 5d orbital.

In the  5d  orbital, 10 electrons.

As the magnetic quantum number is -2, and so it can have 1 electron.

Therefore the  number of electrons present with the values n = 5, l = 2, m = -2, s = +1/2 is one(1)