2930 Valence Electrons Starter Practice: Connection: Answer questions using Periodic Basics 1. What patterns do you see? 2. What do the vertical columns have in common? 3. What do the horizontal columns have in common? 4. What changes move across the table from left to right? Exit: What does the group number tell you? Sep 17, 2014 Glue it in after the notes What do you think purpose of valence electrons are? Valence Electrons Sep 17, 2014 Application: Work on Periodic Basic coloring and questions Write everything unless it is written in green!!!!

Starter What do you think purpose of valence electrons are?

DateLecture/ Activity/ Lab Page 8/29 Syllabus /Notebook Guidelines 1-2 8/29 Periodic Table/ Formula 3-4 8/29 Tools/ Measurement 5-6 8/29 Lab Report/ Investigations 7-8 8/29 Restroom passes/Homework Log /2 Atomic Theory Research notes /3 Atomic Structure /4 Atomic Charges Table of Contents 9/8 Ape Man /9 Electron Placement /10 Valence Electrons /11 Atomic Math /15 Periodic Table Notes /16 Periodic Basics /17 Periodic Basics II 29-30

 The electrons in the outer energy level are called valence electrons What are valence electrons? Practice

How do we know how many valence electrons does an element have? The group number tells us how many valence electrons are in each element.

Atoms of elements in the same group have the same number of electrons in the outer orbitals/levels of their atoms Exceptions: Transition elements (3-12) Helium (actually has 2 valence electrons) Except for He, it has 2 electrons

Examples of Group Elements with the same # of valence electrons 87 Fr (223) 55 Cs Rb K Na Li H How many electrons do each of these atoms have in their outer orbital/level? What group (family) do these elements belong to?

Highlight the outer energy level Name of element # valence electrons Group # HYDROGEN 1 1 Helium 2 18 Lithium 1 1 Nitrogen 5 15

Now Let’s Try Lewis Structures 1) Find your element on the periodic table. 2) Determine the number of valence electrons. 3) This is how many electrons you will draw.

Lewis Structures Find out which group (column) your element is in. Find out which group (column) your element is in. This will tell you the number of valence electrons your element has. This will tell you the number of valence electrons your element has. You will only draw the valence electrons. You will only draw the valence electrons.

Lewis Structures 1) Write the element symbol. 2) Carbon is in the 4 th group, so it has 4 valence electrons. 3) Starting at the right, draw 4 electrons, or dots, counter- clockwise around the element symbol.

Lewis Structures 1) Check your work. 2) Using your periodic table, check that Carbon is in the 4 th group. 3) You should have 4 total electrons, or dots, drawn in for Carbon.

Lewis Structures On your worksheet, try these elements on your own: a) H b) P c) Ca d) Ar

Lewis Structures On your worksheet, try these elements on your own: a) H b) P c) Ca d) Ar

Lewis Structures On your worksheet, try these elements on your own: a) H b) P c) Ca d) Ar

Lewis Structures On your worksheet, try these elements on your own: a) H b) P c) Ca d) Ar

Lewis Structures On your worksheet, try these elements on your own: a) H b) P c) Ca d) Ar

2930 Valence Electrons Starter Practice: Connection: Answer questions using Periodic Basics 1. What patterns do you see? 2. What do the vertical columns have in common? 3. What do the horizontal columns have in common? 4. What changes move across the table from left to right? Exit: Pick an element between 1-20 and make a Bohr model. Please label the protons, neutrons, and electrons. Sep 17, 2014 Glue it in after the notes What do you think purpose of valence electrons are? Valence Electrons Sep 17, 2014 Application: Work on Periodic Basic coloring and questions

{ Periodic Table Basics 1 ________ B 2 ________ 3 _________ 4 P = ____ N= ____ E=____ 5 Step 1. Complete the card for each element. Complete the top section for each element by adding the element’s 1. atomic number 2. name and 3. atomic mass. 4. Determine the number of protons, neutrons, and electrons in each element. 5. Create a Bohr diagram for each element. 5 Boron (10.81)= Application:

Periodic Table Basics Periodic Table Basics Step 2. Use color pencils to shade in the card for each element.  not Colored=Hydrogen  Green= Li & Na  Orange= B & Al  Pink= O & S  Red= C & Si  Blue= Be & Mg  Tan= N & P  Purple= F & Cl  Yellow= He, Ne & Ar

Periodic Table Basics Periodic Table Basics Step 3. Cut the cards apart and arrange according to atomic number in the pattern shown below on a large sheet of construction paper. Step 4. After you have arranged the cards in the correct order, glue them to the paper

Connection: Answer questions using Periodic Basics 1. What patterns do you see? 2. What do the vertical columns have in common? 3. What do the horizontal columns have in common? 4. What changes move across the table from left to right?

Exit: Pick an element between 1-20 and make a Bohr model. Please label the protons, neutrons, and electrons.

2930 Valence Electrons Starter Practice: Connection: Answer questions using Periodic Basics 1. What patterns do you see? 2. What do the vertical columns have in common? 3. What do the horizontal columns have in common? 4. What changes move across the table from left to right? Exit: What does the group number tell you? Sep 17, 2014 Glue it in after the notes What do you think purpose of valence electrons are? Valence Electrons Sep 17, 2014 Application: Work on Periodic Basic coloring and questions