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Electron Configuration Electrons in Atoms Adapted from Christy Johannesen
A. General Rules zPauli Exclusion Principle yEach orbital can hold TWO electrons with opposite spins.
A. General Rules zAufbau Principle yElectrons fill the lowest energy orbitals first. yLazy Tenant Rule
RIGHT WRONG A. General Rules zHunds Rule yWithin a sublevel, place one e - per orbital before pairing them. yEmpty Bus Seat Rule
O 8e - zOrbital Diagram zElectron Configuration 1s 2 2s 2 2p 4 B. Notation 1s 2s 2p
zShorthand Configuration S 16e - Valence Electrons Core Electrons S16e - [Ne] 3s 2 3p 4 1s 2 2s 2 2p 6 3s 2 3p 4 B. Notation zLonghand Configuration
© 1998 by Harcourt Brace & Company s p d (n-1) f (n-2) C. Periodic Patterns
zPeriod # yenergy level (subtract for d & f) zA/B Group # ytotal # of valence e - zColumn within sublevel block y# of e - in sublevel
s-block1st Period 1s 1 1st column of s-block C. Periodic Patterns zExample - Hydrogen
C. Periodic Patterns zShorthand Configuration yCore e - : Go up one row and over to the Noble Gas. yValence e - : On the next row, fill in the # of e - in each sublevel.
[Ar]4s 2 3d 10 4p 2 C. Periodic Patterns zExample - Germanium
zFull energy level zFull sublevel (s, p, d, f) zHalf-full sublevel D. Stability
zElectron Configuration Exceptions yCopper EXPECT :[Ar] 4s 2 3d 9 ACTUALLY :[Ar] 4s 1 3d 10 yCopper gains stability with a full d-sublevel. D. Stability
zElectron Configuration Exceptions yChromium EXPECT :[Ar] 4s 2 3d 4 ACTUALLY :[Ar] 4s 1 3d 5 yChromium gains stability with a half-full d-sublevel. D. Stability
zIon Formation yAtoms gain or lose electrons to become more stable. yIsoelectronic with the Noble Gases.
O 2- 10e - [He] 2s 2 2p 6 D. Stability zIon Electron Configuration yWrite the e - config for the closest Noble Gas yEX: Oxygen ion O 2- Ne
IV. Electron Configuration (p , ) Ch. 4 - Electrons in Atoms.
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ELECTRON CONFIGURATIONS. Electron Configuration: A method for communicating the location and number of electrons in the electron energy levels. 3p 5 Principal.
1s2s 2p3s 3p 3d n = 1 n = 2 n = 3. NUCLEUS 1s 2s 2p 3s 3p 3d 4s 4p4d 4f Energy Level SublevelsTotal Orbitals 1s1s1s 2s,p1s+3p = 4 3s,p,d1s+3p+5d = 9 4s,p,d,f1s+3p+5d+7f.
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