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Electron Configuration

ONLY Exceptions to electron configuration

Cu copper
Ag Silver
Au Gold
Cr Chromium
Mo Molybdenum

Ending alkali metals


Ending alkaline earth


Ending nonmetals

P something
upper right hand of periodic table

Ending metals

S something or d something
Left side periodic table

Ending Halogens


Ending Noble gas



For magnetic field
Attracted to magnetic field
has odd # of electrons
has unpaired electrons


Not attracted to mag. field
Has completely paired electrons in orbitals

4S orbital in 4th shell is after

the 3d orbital/ shell


shell number or principal quantum number


number of orbitals

2 x n^2

# electrons

All Electron configuration rules apply to

GROUND state only (neutral atom)
not excited state

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