1. Unit 3: Moving Electrons & Bonding
12/2/15 (W)
Unit 3: Moving Electrons & Bonding
Learning Target:
I can relate the patterns in the properties of substances with the strength of the forces between particles (chemical bonds).
LT3.a Electron Structure
LT3.b Ionic Compounds

2. LAST DAY to turn in “N” assignments 12/18/15
W., Dec/ 2nd
LAST DAY to turn in “N” assignments 12/18/15
Why do elements in the same group in the periodic table have similar properties?
Agenda:
Electron Shell Model
Classwork: Lesson 18 Life on the Edge
Lesson 18 Notes
Begin Homework reading
Homework DUE next class:
Turn in Flame Lab Summary!!!
READ pp and DO (#1,2,6-10)

3. Pick up handout and turn to the ChemCatalyst:
LIST patterns in the number of spokes on circles:
The spokes represent electrons. Do the spokes represent the total number of electrons? Explain your thinking.
The number of spokes increases by one across a period.
The number of spokes is the same down a column
Except for He and H the spokes do not represent total electrons. Lithium has 3 electrons but the picture shows one spoke.

4. The Shell Model
The surface of each sphere represents an area where an electron or a group of electrons is most likely to be found.

5. Life on the Edge Complete all parts of Lesson 18
Remain seated and on task
Finish By: 15 minutes
I will cold call students to share answers
IF you finish early, begin the homework reading.

6. Lesson 18 Notes You need a pencil Your Blue Periodic Table
Something to write on

7. Vocabulary (Unit Intro)
Valence shell: The outermost electron shell in an atom.
Valence electrons: The electrons located in the outermost electron shell of an atom.
Core electrons: All other electrons in an atom besides the valence electrons.

8. Use slide to help students fill in the table with core and valence electrons

9. General Patterns of Electrons
Atomic number = number of electrons for neutral atoms
Period number = the number of electron shells
For main group elements, the group number = number of valence electrons

10. Patterns in Valence & Core Electrons
What patterns do you see in valence electrons?
Valence electrons increase by one across a period
Valence electrons are the same down a group for the main group elements.

11. Patterns in Valence & Core Electrons
What patterns do you see in core electrons across the second row?
Core electrons remain at 2 across the second row. They are 10 across the third row.

12. Patterns in Valence & Core Electrons
Why is there a change in the number of core electrons across the fourth row?
There are ten transition elements between Calcium and Gallium and those ten electrons fill the third shell

13. Check In #1 For element 34, give the following:
Element name and Symbol
The group number
Is it a metal, nonmetal or metalloid?
Total electrons
Number of valence electrons
Number of core electrons
Name 2 elements with the same valence electrons
Selenium, Se
Group 6A
nonmetal
34 electrons
6 valence electrons
28 core electrons
oxygen
sulfur
Selenium, Se
Group 6A
nonmetal
34 electrons
6 valence electrons
28 core electrons (34-6=28)
O, S

14. Check In #2 For element 37, give the following:
Element name and Symbol
The group number
Is it a metal, nonmetal or metalloid?
Total electrons
Number of valence electrons
Number of core electrons
Name 2 elements with the same valence electrons
Rubidium, Rb
Group 1A Alkali metals
Metal
37 electrons
1 valence electron
36 core electrons
Any other Group 1A metal
Rubidium, Rb
Group 1A Alkali metals
Metal
37 electrons
1 valence electron
36 core electrons
Any other Group 1A metal

15. Check In #3 What do Be, Mg, and Ca all have in common?
Two valence electrons

16. Check In #4 Draw a shell model for boron (B).
Identify the valence and core electrons

17. Packet Unit #3 (due 12/16) [11/16] Unit 3 Introduction
[11/18] Lesson 17 Lab all questions answered
11/20] Book Exercises on p. 90 (#1-2, 5-11)
[11/24] Kaboom movie notes
[12/2] Lesson 18 all questions answered
Homework DUE next class is:
Read pp
DO exercises #1-2, 6-10

18. Period 7 End of Class Routine
Time to Pack Up
Students will:
Stow their stuff
Remain at desk until bell rings
May be on their devices
Dispose of trash on the way out
Starting today we have a new routine.
The 12 students who remained on Friday get their prize today.
When we return, the whole class will have the opportunity to earn Krispee Kremes to be awarded at the end of class on December 18th.