Question

how are quantum no.s n , l , m , for hydrogen atom obtained​

Answer 1

Hydrogen electronic configuration is given as $1s^{1}$.

Principle Quantum number (n) :-

The Principal quantum numbers indicate energy levels as well as relative distance from the nucleus.

It can be found out by seeing the number in the last orbital of electronic configuration. Here $1s^{1}$, the 1 is the principle quantum number.

Azimuthal Quantum Number (l):-

Azimuthal Quantum Number can be said from the last shell. Here, s is the last shell.So Azimuthal Quantum Number will be 0.

Azimuthal Quantum Number for s is 0.

Azimuthal Quantum Number for p is 1.

Azimuthal Quantum Number for d is 2.

Azimuthal Quantum Number for f is 3.

Magnetic Quantum number (m):-

Magnetic Quantum number is any number between -l to +l where l is the Azimuthal Quantum Number.

Here since Azimuthal Quantum Number is 0. So, only possibility is that Magnetic Quantum number also should be 0.