Today’s Agenda .th 10/7/10•Warm up (Have your notebooks ready)

•Noble Gasses

•How to finish your packet

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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