In chemistry, a 3p orbital refers to one of the orbitals in the p subshell of the third energy level (n=3). The "3p" designation indicates that the orbital is in the third principal energy level (n=3) and has the angular momentum quantum number (l) equal to 1, corresponding to the p subshell.
A p orbital has a dumbbell shape and consists of two lobes separated by a nodal plane. The number of nodes in a p orbital can be determined by subtracting 1 from the angular momentum quantum number (l). In this case, since l=1 for a 3p orbital, there would be 1 node present.
Therefore, a 3p orbital has 1 node.