1. Class Directions Friday, 12-14-12 You are ONLY to be on my science site. HEADPHONES WILL NOT BE NEEDED. 3 RD Period: 1.Begin with Thursday’s Periodic Table Lesson 1 Notes, make sure you have copied all underlined info into your ISN. 2.Start Periodic Table Lesson 2 Notes for today 4 th Period 1.Start on Periodic Table Lesson 2 Notes for today. Work through Lesson 2 as you would with me

2. Periodic Table Lesson 2 WE WILL HAVE AN OPEN ISN QUIZ ON MONDAY OVER ATOMS AND PERIODIC TABLE.

3. Bellwork – Atomic Structure Identify the Nucleus, Protons, Neutrons, Electrons, Charges of Particles and Shells in the diagram below.

4. Bellwork Identify the Nucleus, Protons, Neutrons, Electrons, Charges of Particles and Shells in the diagram below Electron Proton Neutron Shell Nucleus

5. Element Output ISN p. 94 1.Select ONE element from the periodic table. 2.Draw its “Square” on ISN p. 94. 3.Label the Atomic Number, Symbol, Name, and Atomic Mass (Mass Number) of the element you chose. 4.Write the Period and Group your element is from. 5.Write if it is a metal, metalloid, non-metal. 6.Write if it is a solid, liquid or gas.

6. Periodic Table Lesson 2 Label ISN p. 97 with above title All notes in this lesson will go on ISN p. 97

7. Objective and Essential Question Objective: Use the Periodic Table to determine the number of shells, valence electrons and reactivity of elements. Essential Question: How can the PT help us draw a diagram of an atom?

8. Periodic Table Lesson 2 Shells – Electrons have rings, or orbitals, or shells that they travel on. Similar to the orbits the plants move on as they orbit the sun. – Basically, it is their path around the nucleus.

9. Periodic Table Lesson 2 Gaining and Losing Electrons – Valence electrons – electrons located in the outer shell only. – Elements with 1, 2, or 3 valence electrons give up (lose) electrons (become positive) – Elements with 4 or more valence electrons receive electrons from other elements and become negative) Note: You will find out how to do this later in the lesson.

10. Atomic Structure Notes Write this chart in your notes Shell Number Number of Electrons 1 – closest to nucleus 2 28 318 432 550 672 1 2 3 4 7 6 5

11. Review - Electrons and Periodic Table What can we use the periodic table for? –F–Finding atomic number, atomic mass, chemical symbol, patterns in properties, type of element, state at room temperature –A–ALL FROM A LITTLE SQUARE! Mendeleev discovered a repeating pattern (periodic) of the elements that repeated every 7 elements and developed the Periodic Table.

12. Using the table to understand the elements Element Reactivity (Periods) – Reactivity INCREASES the farther left and the farther down the period table. – Decreases as you move up or right For instance Fr (francium) is more reactive than K (potassium). Calcium (Ca) is slightly less reactive than K

13. Using the table to understand the elements Valence Electrons Columns (Groups) – They all have similar chemical and physical properties – Columns tell us how many electrons are in outer level. We do not use Groups 3-12 when counting electrons. Group 1 = 1, Group 2 = 2, Group 13=3, Group 14=4, Group 15=5, Group 16=6, Group 17=7, Group 18=8

14. Now, Let’s See what this all means. On the next slides, use the Periodic Table on TEXTBOOK pages 768-769. Also, practice the skills as you move through the lesson. This is a big part of your model building next week. Note: – Periods tell how many shells are in an atom – Groups tell how many valance electrons in an atom

15. Periodic Table Study Guide Determining Shells and Valence Electrons 5 th Grade Science Mrs. LaRosa www.middleschoolscience.comwww.middleschoolscience.com 2008 All images are from www.Chem4kids.comwww.Chem4kids.com

16. Periods Each row is called a “period” The elements in each period have the same number of shells around the nucleus. www.chem4kids.com

17. Groups Each column is called a “group” Each element in a group has the same number of electrons in their outer orbital, also known as “shells”. Except for He, it has 2 electrons The electrons in the outer shell are called “valence electrons” www.chem4kids.com

18. Transition Metals Transition Metals have slightly different rules for shells and valence electrons. This is something you will learn about in High School Chemistry. www.chem4kids.com

19. Let’s Practice Find the number of shells and valence electrons for Magnesium (Atomic Number = 12). Ask yourself: Electron shells: – What period (row) is it in? Valence Electrons: – What group (column) is it in?

20. Let’s Practice Find the number of shells and valence electrons for Magnesium (Atomic Number = 12). Ask yourself: Electron shells: – What period (row) is it in? 3 rd period= 3 shells Valence Electrons: – What group (column) is it in? 2 nd group = 2 valence electrons

21. Determine the number of shells and the number of valence electrons for: www.chem4kids.com

22. Determine the number of shells and the number of valence electrons for: www.chem4kids.com

33. Shells and Valence Electron Output ISN p. 96 Pick any element in group 1, 2, 13, 14, 15, 16, 17 or 18 and write the: 1.Element Name 2.Chemical Symbol 3.Number of Protons/Atomic Number 4.Number of Electrons 5.Atomic Mass 6.Number of Shells 7.Number of Valence Electrons 8.Draw it on your paper. 1.Include the correct number of protons and neutrons 2.Include the correct number of electrons 3.Include the correct number of shells and valence electrons. 1.Use the chart on ISN p. 97 to fill in each shell until it is full.