Orbital Diagram and Electron Configuration

• The electron configuration of an element describes how

  electrons are distributed in its atomic orbitals.
• Noble gases

  He, Ne, Ar, Kr, Xe and Rn
• Aufbau Principles electron configuration - electrons will occupy the orbitals having lower energies before occupying higher energy orbitals.
• Hund’s Principles electron configuration - Every orbital in a sublevel is singly occupied before any orbital is doubly occupied. All of the electrons in singly occupied orbitals have the same spin (to maximize total spin).
• Pauli’s Exclusion Principles electron configuration - no two electrons can have the same four electronic quantum numbers. As an orbital can contain a maximum of only two electrons, the two electrons must have opposing spins.
• Diamagnetism - is the property of materials that are repelled by a magnetic field; -paired electrons
• Paramagnetism - if it shows unpaired electrons, then the substance

  is paramagnetic;