In other words, an electron found in n equals one is lower in energy than if an electron is found in N equals two. So the higher the n, the greater the size of the atom and the greater the energy level in which our electron is in. The second quantum number is known as the osmic quantum number and is represented by the lowercase cursive l.
Now, this quantum number designates the subshell in which our electron is in. And the number of subshells. This letter N depends on the principal quantum number, and it's given by the following equation l equals n equals one. In other words, if we know that our principal quantum number in which our electron is located is n equals four, then our subshell is n minus one So four minus one L equals three.