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ELECTRONIC CONFIGURATION
ELECTRONIC CONFIGURATION -arrangement of electrons in the space around the nucleus of an atom. -distribution of electrons in the orbitals of an atom.
ELECTRONIC CONFIGURATION ENERGY LEVEL (electron shell) -orbit where electrons spin around the nucleus of an atom.
ELECTRONIC CONFIGURATION
ELECTRONIC CONFIGURATION ENERGY SUBLEVEL (subshell) -energy subdivision of a principal energy level. -designated by:  s(sharp)			 p (principal)			 d (diffuse)				 f (fundamental)
Mnemonic Device for Electronic Configuration
Electronic configuration of: IodineI53 = 1s2  2s2  2p6  3s2  3p6  4s2  3d10  4p6  5s2  4d10  5p5
Electronic configuration of: Silicon   Si14 = 1s2  2s2  2p6  3s2  3p2 LeadPb82 = 1s2  2s2  2p6  3s2  3p6 4s2 3d10  4p6  5s2  4d10  5p6  6s2 4f14  5d10 6p2
RULES  AND  CONCEPTS
AUFBAU’S PRINCIPLE -”aufbau” –building up -principle of electrons filling up the orbitals in order of increasing energy.
PAULI’S EXCLUSION PRINCIPLE -an orbital may be occupied by a maximum of two (2) electrons. -the maximum number of electrons in each of the sublevels and orbitals:
HUND’S RULE -if electrons have more than one equivalent orbital available, they will half-fill each of the equivalent orbitals before filling the second half of each.
Example: Electronic configuration of:    14N = 1s2 2s2 2p37
Electronic configuration of:56Fe= 1s22s2 2p6 3s2 3p6 4s2 3d 626

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Electronic configuration