Question

principal quantum number for N_ shell is ? A) 1 B) 2 C) 3 D) 4​

Answer 1

Answer:

The quantum number n is called the principle quantum number. You already know this as shell. The shell "K" has been given the value n = 1, the "L" shell has been given the value n = 2. The principle quantum number serves to determine the size of the orbital, or how far the electron extends from the nucleus.

Answer 2

Principal quantum number describes the size and to a large extent the energy of the orbital.

It can have values = 1 , 2 , 3 ...

K --> 1

L --> 2

M --> 3

N --> 4

Therefore option D) 4 is correct.

there you go :)