Academic Chemistry
Guided Notes – Electron Location
Name ________________________
Date _________________________
ELECTRONS

Quantum Mechanical (QM) Model- This is the currently accepted model of the atom.
o Erwin Schrödinger wrote an equation which describes _______________________________
__________________________________________________________________________.


These locations are not definite because of the Heisenberg Uncertainty Principle.
Each of the following terms gives a more specific description of where an electron probably is.
In Chemistry…
In CB South, for example…
o Energy level, n
o Sublevel, l
o Orbital, ml
o Spin, s

Energy Levels, no An electron may NOT be found _____
_______________________________.
o Higher n = higher energy (typically)
o n is called the ______________
_____________________________.
o To determine how many electrons fit into a
given energy level, use this formula: _____
o The maximum number of electrons is 32.
o Electrons will occupy ________________________________ first.

Sublevels (subshells), l-
s Sublevel
Shape
Appears
# of Orbitals
Capacity
orbitals
p Sublevel
d Sublevel
f Sublevel
ELECTRON CONFIGURATIONS
 Electron Configurations
Electron Configuration PRACTICE
o Sulfur (S)
o Calcium (Ca)
o Cobalt (Co)
o Chromium (Cr)
o Strontium (Sr)
o Zinc (Zn)
o Molybdenum (Mo)
o Selenium (Se)
o Antimony (Sb)
o 1s22s22p63s23p4
o Chlorine (Cl)
o 1s22s22p63s23p64s23d10
o 1s22s22p63s23p64s23d104p1

Shorthand notation- To write in shorthand electron configuration notation:
o 1st – Find the _________________ that is in the row above the element you want
o 2nd – Write that noble gas's __________ in [brackets]
o 3rd – Then continue with the e– configuration starting with the next element

Ex- Scandium: 1s22s22p63s23p64s23d1 

Ex- Chlorine: 1s22s22p63s23p5 
ORBITAL NOTATIONS & THE RULES
 Orbital notations-

o Ex- Titanium: ___
1s
Aufbau Principle-

o This is the order we get from “reading” the Periodic Table.
Pauli Exclusion Principle-

o This is the electron “spin.” Either +½ or –½
Hund’s Rule –
___ ___ ___ ___
2s
2p
o They’d rather spread out.
___
3s
___ ___ ___
3p
___
4s
___ ___ ___ ___ ___
3d