Can anyone explain atomic orbitals n , l , p, s ?

Answer 1

Orbitals are characterized by 4 Numbers called quantum numbers
The first is n which characterize the size of the orbital.As n increases the size increases
The second is l always lower than n characterizes the form of orbital for l = 0 the orbital is spherical , and forms becomes more complicated than l increases
The third m gives the orientation
The fourth s (spin) is positive or negative depending on the sense of rotation of the electron

In an atom two electrons can not have identical numbers