What are the number of sublevels and electrons for the first four principal quantum numbers?
1 Answer
For quantum number 1, the number of sub level is 1, number of electrons= 2.
For quantum number 2, no. of sub levels are 2, no. of electrons= 8. For quantum no. 3, sub levels are 3 and no. of electrons are 18.
For 4th quantum no. sub levels are 4 and electrons are 32.
Explanation:
You can easily calculate it with this method :

Suppose the principal quantum number is symbolized as
#n# the Azimuthal or secondary quantum number is symbolized as#l#
the magnetic Q.N is#m#
and the spin Q.N is#s# . 
#n# = which energy shell it is;#l# = number of subshells;#m# = number of orbitals as well as electrons.
#l# =0,#n1# and#m# =#+# l =#l, 0, +l# . 
For example, in case of principal quantum number 2,
the result of#l# is =#n1# = 21 = 1, which means the number of subshells are two : 0 and 1.
Now the result for
So the total number of electrons for principal quantum number 2 is 8 .