Paulis\'s rule : Electrons fill orbitals having lowest energy states i.e. 1s before 2s Hund\'s principle : when multiple orbitals of same energy are available, electrons fill the unoccupied orbitals first and then reoccupy the occupied orbitals by electrons having opposite spin. 1, 3, and 4 come under Hund\'s rule violation and 2,5 under paulis violation. 1) Electrons should be paired by different spin - hunds rule violation 3) electrons fill the unoccupied orbitals first and then reoccupy the occupied orbitals - hunds rule violation 4) - hunds rule violation 2) Electrons fill orbitals having lowest energy states i.e. 2s before 2p - paulis rule violation 5) Electrons fill orbitals having lowest energy states i.e.4p before 4d so paulis rule violation 2) Electrons fill orbitals having lowest energy states i.e. 2s before 2p - paulis rule violation 5) Electrons fill orbitals having lowest energy states i.e.4p before 4d so paulis rule violation Solution Paulis\'s rule : Electrons fill orbitals having lowest energy states i.e. 1s before 2s Hund\'s principle : when multiple orbitals of same energy are available, electrons fill the unoccupied orbitals first and then reoccupy the occupied orbitals by electrons having opposite spin. 1, 3, and 4 come under Hund\'s rule violation and 2,5 under paulis violation. 1) Electrons should be paired by different spin - hunds rule violation 3) electrons fill the unoccupied orbitals first and then reoccupy the occupied orbitals - hunds rule violation 4) - hunds rule violation 2) Electrons fill orbitals having lowest energy states i.e. 2s before 2p - paulis rule violation 5) Electrons fill orbitals having lowest energy states i.e.4p before 4d so paulis rule violation 2) Electrons fill orbitals having lowest energy states i.e. 2s before 2p - paulis rule violation 5) Electrons fill orbitals having lowest energy states i.e.4p before 4d so paulis rule violation.