# What is the number of the lowest energy level that has a p sublevel?

##### 1 Answer

Jun 23, 2017

If we seek the lowest energy level (given by the principal quantum number

The **principal quantum number** is defined as:

#n = 1, 2, . . . # , in integer steps

and the **angular momentum quantum number** is defined as:

#l = 0, 1, 2, . . . , n-1# , in integer steps, where#l_max = n - 1# .

Since

Likewise...

#n = 1# is the minimum#n# for which#s# orbitals exist.

(#l_max = n - 1 = 0# .)#n = 3# is the minimum#n# for which#d# orbitals exist.

(#l_max = n - 1 = 2# .)#n = 4# is the minimum#n# for which#f# orbitals exist.

(#l_max = n - 1 = 3# .)

etc.