What is the correct representation for the sub shell with n=2 and i= 1

“n” represents the energy level of any atom.

And “l” represents the sub levels within any energy level.

n = 1 would mean first energy shell or level.
n = 2 would mean second energy level. Similarly, n =3 would mean third energy level and so on.

“l” can have values 0,1,2,3 so on
l = 0 means “s” sublevel
l = 1 means “p” sublevel
l = 2 means “d” sublevel
l = 3 means “f” sublevel

Now let’s see the question... n = 2 and l = 1 means 2nd energy level and within that level he is talking about p sublevel. So the correct representation is

“2p”..

The answer is 2p