The type and shape of orbital is given by the secondary quantum number l. As we khow, this number has values that depend on n such that l=0,1,...n-1.Furthermore,orbitals are not referred to by their numerical l valuse,but rather by small case letters associated with those values.thus,when l = 0 we talk about s orbitals. When l = 1 we talk about p orbitals. When l = 2 we talk about d orbitals, and so on.In organic chemistry,we are mostly concerned with the elements of the second row and threrfore will seldom refer to l values greater than 1. We’ll be talking mostly about s and p orbitals, and accasionally about d d orbitals in reference to third row element