Aufbau's Principle - Electrons fill the lowest energy orbitals first and other orbitals in order of ascending energy, Pauli exclusion principle - No two electrons in an atom can have the same four quantum numbers (n, , m, s), Hund's Rule - when electrons are added to the orbital of equivalent energy (or degenerate orbitals), each orbital are filled singly with electron of the parallel spins (same)first before it is paired, Electronic configuration of Nitrogen (Ar N =7) - 1s 2 2s 2 2p 3, It is the orbital diagram is allowed - Not Allow, Orbital diagram - each orbital is represented by a box and each electron by an arrow, spdf notation - denoted by writing the symbol for the occupied orbital and adding a superscript to indicate the number of electrons in that orbital, Which orbital you want to remove their electron from atom Na to form Na + - 3s 1, Which orbital you want add electron to form ion Cl -   - 3p 5, Valence electronic configution for atom  Al is - 3s 2  3p 1, Valence electronic configution for atom N is  - 2s 2  2p 3, It is the orbital diagram is allowed or not - Allow,

ELECTRONIC CONFIGURATION

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