Filling Of Electrons In Orbitals

Modern Periodic Table|Quick Recap To Filling Of Electrons In Orbitals Of Shells|Aufbau Principle|General Electronic Configuration Of S Block|General Electronic Configuration Of P Block|General Electronic Configuration Of D Block|General Electronic Configuration Of F Block|OMR|Summary

(i) State aufbau principle for filling of electron in orbitals in atom. (ii) write electronic configuration of (a) "Cr" (b) Fe^(+2)

Rules OF Filling OF Electrons || Aufbau's Principle || (n+l) rule || Hund's Rule OF Maximum Multiplicity || Pauli's Exclusion Principle || Reason OF Stability OF Half filled and Fully filled Orbitals || Electronic Configuration OF First 30 elements

Electron Orbits

Filling of Electrons in Molecular Orbitals

Molecular orbital theory || Filling OF electrons in molecular orbitals || Bond order,magnetic character and stability OF species

While filling up of electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why?