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Today’s Agenda .th 10/7/10•Warm up (Have your notebooks ready)
•Noble Gasses
•How to finish your packet
New Website
You can get notes and homework from:
http://teachers.yourhomework.com/blowe/
Warm up
Write the electron configuration for:
He
Ne
Ar
What do they all have in common?
Electrons, position on Periodic Table, etc.?
1s 2
1s 2s 2p2 2
1s 2s 2p 3s 3p 2 2 6 62
Answers
• All these elements are have full electron shells
• All these elements have no valence electrons
• All these elements are located on the right side of the periodic table.
• B/c of the lack of valence electrons, these elements do not react much.
Nobel Gasses
• The Nobel Gasses are located on the right side of the periodic table.
• They are also called the “Inert Gasses”• These elements have a full electron shell• Because of the full shell, these gasses
tend not to react with other elements
Now how to finish your packetElement Number of
valence electrons
Electrons lost or gained to
become stable
Charge and symbol of the
ion
Same structure as which noble
gas?
Hydrogen 1 Loss 1 H+ none
Element Number of valence
electrons
Electrons lost or gained to
become stable
Charge and symbol of the
ion
Same structure as which noble
gas?
Helium 2 none He He
Element Number of valence
electrons
Electrons lost or gained to
become stable
Charge and symbol of the
ion
Same structure as which noble
gas?
Lithium 1 Loss 1 Li+ He
Element Number of valence
electrons
Electrons lost or gained to
become stable
Charge and symbol of the
ion
Same structure as which noble
gas?
Carbon 4
But wait! Does Carbon want to loss 4 electrons or gain 4 electrons
When you have this question, the answer is the atom ALWAYS wants to loss the 4 electrons
Loss 4 C4+
It lost 4 electrons so it has a positive 4 charge
He
The Equations is: C – 4e- –> C4+
Element Number of valence
electrons
Electrons lost or gained to
become stable
Charge and symbol of the
ion
Same structure as which noble
gas?
Nitrogen 5
It wants to gain 3 electrons to fill its outer shell
Gain 3 N3-
It gained 3 electrons so it now has a 3- charge
Ne
The Equations is: N + 3e- –> N3-
Last Table in your packet
• Complete the table for the Following Ions!
You have to assume that the Atom has changed to a stable Ion
Atomic Number
Element Symbol Atomic Mass
Protons Electrons Neutrons
19 Potassium
39.10 19 20K+
Remember, its an ION!So it gave up one electron so it’s not 19 but…
18
Example of an Ionic Equation
HomeworkFinish up packet and study for quiz
tomorrow 10/8/10:• Electron configuration• Ions and Iconic Equations• Bohr model vs. modern (electron
configuration)• Filling in the tables (from the packet)• Periodic table connections and facts
You also have a test Monday! 10/11/10
