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

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. 91-94 and DO (#1,2,6-10)

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.

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.

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.

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

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.

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

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

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.

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.

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

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

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

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

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

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. 91-94 DO exercises #1-2, 6-10

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.