Transcript Document

Cornell Notes: Please take out your
notebook and properly set up your
paper.
Topic: Electron
Configuration
Date: 11/28/2012
Electron Configuration:
Standard Notation & Noble
Gas Configuration
Mapping the electrons
Objective:
SWBAT apply the Pauli exclusion principle, the
aufbau principle, & Hund’s rule to write
electron configuration notation.
Essential Question:
Predict the complete electron
configuration and Noble Gas
Configuration of Sulfur.
What is an Electron Configuration?

a shorthand description of how
electrons are arranged around the
nucleus of an atom.
Why is electron configuration
important?

It helps us predict chemical behavior.

We can predict whether two elements will
react or not; and if they react, we can also
predict what kind of reaction we are likely to
have, as well as how strong the reaction will
be.
Standard notation is like giving the address
of an element based on it’s electron
configuration…



The periodic table contains four blocks:
s, p, d, and f.
Each period (row) of the PT has an
energy level (like floors in a building).
In standard notation, always begin at
the starting point of hydrogen, and
snake through each period from left to
right until the element is reached.
Take out your blank periodic table and
outline the four “blocks”: s, p, d, & f.
*If you have highlighters or colored pencils, use them now!
DO NOT write inside the boxes!!
Energy Levels on the Periodic Table
 for the S & P block, the energy level (n) = the period number
 for the D block, the energy level (n) = the period – 1
 for the F block, the energy level (n) = the period – 2
1
2
1s
1s
2s
2p
3
3p
4
3d
5
4d
6
7
4f
Period
Numbers
5f
Blocks in the Periodic Table
Energy Levels on the Periodic Table
 for the S & P block, the energy level (n) = the period number
 for the D block, the energy level (n) = the period – 1
 for the F block, the energy level (n) = the period – 2
1
1s1
2
2s1 2s2
1s2
2p1 2p2
3
3p1 3p2
4
3d1 3d2 3d3
5
4d1 4d2
6
7
4f1 4f2
5f1 5f2
Electron Configuration Notation Table
What is the standard notation of
F
Fluorine?
F: 1s2..
What is the standard notation of
F
Fluorine?
F: 1s22s2..
What is the standard notation of
F
Fluorine?
F: 1s22s22p5
Standard Notation
of Fluorine
2
1s
Number of electrons
in the sub level 2,2,5
2
2s
5
2p
Sublevels
Practice creating the standard
notation for:

N:

Mg

Br

Tc
What is the standard notation of
N
Nitrogen?
N: 1s2..
What is the standard notation of
N
Nitrogen?
N: 1s22s2..
What is the standard notation of
N
Nitrogen?
N: 1s22s22p3
Practice creating the standard
notation for:

N: 1s2 2s2 2p3

Mg

Br

Tc
Practice creating the standard
notation for:

N: 1s2 2s2 2p3

Mg: 1s22s22p63s2

Br

Tc
Practice creating the standard
notation for:

N: 1s2 2s2 2p3

Mg: 1s22s22p63s2

Br: 1s22s22p63s23p64s23d104p5

Tc
Practice creating the standard
notation for:

N: 1s2 2s2 2p3

Mg: 1s2 2s2 2p6 3s2

Br: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5

Tc: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d5
Shorthand Notation (“Noble
Gas Configuration – NGC”)




Use the last noble gas that is located in
the periodic table right before the
element.
Write the symbol of the noble gas in
brackets.
Write the remaining configuration after
the brackets.
Ex: Fluorine: [He] 2s2 2p5
Practice creating the Noble
Gas Configuration (NGC) for:

N:

Mg:

Br:

Tc:
Practice creating the Noble
Gas Configuration (NGC) for:

N: [He] 2s2 2p3

Mg:

Br:

Tc:
Practice creating the Noble
Gas Configuration (NGC) for:

N: [He] 2s2 2p3

Mg: [Ne] 3s2

Br:

Tc:
Practice creating the Noble
Gas Configuration (NGC) for:

N: [He] 2s2 2p3

Mg: [Ne] 3s2

Br: [Ar] 4s2 3d10 4p5

Tc:
Practice creating the Noble
Gas Configuration (NGC) for:

N: [He] 2s2 2p3

Mg: [Ne] 3s2

Br: [Ar] 4s2 3d10 4p5

Tc: [Kr] 5s2 4d5
End of Notes!
Now it is time to:
1. Summarize your CN
2. Answer the essential
question.