Question

how many subshells are associated with n = 4​

Answer 1

There are 4 sub shells associated with shell n =4 ; because the Azimuthal quantum no., representing the sub-shells is from 0 to (n-1), i.e , 0,1,2...., (n-1). As there are 4 sub shells, those will be :- s,p,d,f giving a total of = 1+3+5+7= 16 orbitals and 1 electrons for each orbital with ms= -1/2 and +1/2 each..