The Magnetic Quantum Number is the third quantum number. The Magnetic quantum number is used to designate the number of orientations of the various types of orbitals on the three-dimensional axis system. The number of possible values of m associated with a specific value of l will indicate the number of different orientations of the particular orbital type.
Nodes are points in space that have zero probability for locating an electron there.
A good example of a node is the nucleus. A nodal surface is usually a spherical surface with infinitely small thickness. Nodal surfaces appear as concentric spheres around the nucleus of an atom. These are also positions around an atom where there is zero probability of locating an electron. Orbitals Orbitals are probability diagrams.