Explain why atoms with half filled and completely filled orbitals have extra stability ?

Match the following rules with their statement : {:(,"Rules",,"Statements",),(("a"),"Hund's Rule",("i"),"No two electrons in an atom can have the same set of four quantum numbers.",),("(b)","Aufbau Principle",("ii"),"Half-filled and completely filled orbitals have extra stability.",),("(c)","Pauli Exclusion Principle",("iii"),"Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital is singly occupied.",),(("d"),"Heisenberg's Uncertainty","(iv)","It is impossible to determine the exact position and exact momentum of a subatomic particle simultaneously.",),(,,("v"),"In the ground state of atoms, orbitals are filled in the order of their increasing energies.",):}

Statement-1 : The third ionisation enthalpy of La, Gd and Lu are abnormally low. Statement-2 : Empty, half-filled and completelt filled orbitals of f-level are extra stable.

Half-filled and fully-filled orbital orbitals are more stable

Which of the following has completely filled d-orbital?

The extra stability of half-filled and completely-filled subshell is due to

Number of completely filled orbitals in xenon atom (Xe) is:

The correct order of relative stability of half filled and completely filled sub-shell is