4-3
ELECTRON
CONFIGURATIONS
Beaker Breaker
1. An energy level of n=3 can hold how
many electrons?
2. The second quantum number (Angular
Momentum Quantum Number, l) for n=2
is_____________
3. The letter denotation (shapes) for n =2 is?
Hund’s Rule
• Orbitals of equal energy are each
occupied by one electron before
any orbital is occupied by a second
electron, and…
• All electrons in singly occupied
orbitals must have the same spin
Relative Energies of Orbitals
Order of increasing energy for each orbital
p. 105 and 110)
Aufbau Principle
• An electron occupies the
lowest-energy orbital that can
receive it
Beaker Breaker
• Write the orbital notation of Oxygen (O)
• Write the orbital notation of Ti
Noble Gas Notation
• What is the noble gas configuration for
calcium?
• 1s22s22p63s23p64s2
• [Ar]4s2
• What is the noble gas config for S?
• 1s22s22p63s23p4
• [Ne]3s2 3p4
Beaker Partner Practice Problems
•
The electron configuration of fluorine is 1s22s22p5
What is the atomic number of fluorine? How many of
its p orbitals are filled? How many unpaired electrons
does a fluorine atom contain?
•
Write the electron configuration, noble gas configuration
and orbital notation for:
Na
Al
Cl
P
1.
2.
3.
4.
Beaker Breaker Problem
Complete the electron configuration and
noble-gas configuration only of
chlorine (Cl)
Open books to page 110 please
Objective
• Describe the electron configurations for the
atoms of any element using oribital
notation, electron-configuration notation
and when appropriate, noble-gas notation.
Beaker Partner Activity
• Complete the electron configuration and
noble gas configuration only of the
following elements
• Cadmium (Cd)
• Tin (Sn)
Objective
• Describe the electron configurations for the
atoms of any element using oribital
notation, electron-configuration notation
and when appropriate, noble-gas notation.
PREDICTED
PreClass: Write the following
notations for the element
chromium (Z = 24):
• Electron configuration
• Orbital notation
• Noble gas
jbechtel:
GO THRU Ca
ELEMENT
Cr
Mn
Cu
Zn
ORBITAL
ELECTRON
NOTATION CONFIGURATION
NOTATION
Beaker Breaker
Write the following notations for the
element nickel (Z=28):
• Orbital notation
• Electron configuration
• Noble gas
PreClass: Write the following
notations for the element bismuth
(Z = 83):
• Electron configuration
• Orbital notation
• Noble gas
rd
3
Why can the
energy
level hold 18 electrons?