Orbital is the region in an atom where the probability of finding the electron is maximum. It represents three-dimensonal motion of an electron around the nucleus. Orbitals do not specify a definite path according to the uncertainty principle. An orbital is described with the help of wave

function ψ . Whenever an electron is described by a wave function, we say that an electron occupies that orbital. Since many wave functions are possible for an electron, there are many atomic orbitals in an atom. Orbitals have different shapes; except

s-orbitals, all other orbitals have directional character. Number of spherical nodes in an orbital is equal to (n– λ –1). Orbital angular momentum of an electron is .

(i) The nodes present in 5p orbital are –