Catalyst February 30 4 2013 HW OUT PLEASE

Catalyst – February 30 -4, 2013 HW OUT PLEASE! Using the PT, choose and record an element from each of the following groups: 1. Alkali Metals 2. Transition Metals 3. Noble Gases 4. Anctinides 5. Metalloids 6. Halogens

Our Periodic Table – Thanks to Mosely

Today’s Agenda (FYI: Quizzes back tomorrow) Catalyst HW Questions? Notes: Periodic Trends PT Trends Work CUZ WE RIDIN NERDY! Project Work Time Exit Question, Lab Fees, and Progress Reports! HOMEWORK: PERIODIC TRENDS WORKSHEET

Periodic Table Project Will choose an element from the list provided No one can have the same element! Part 1: Element Card for the wall (25 Points) Part 2: Element Facebook Page (75 Points) Cool Source! You. Tube Periodic “Table of Videos”

HAPPY NERD DAY!!!! HW Questions? ? ?

Today’s Objectives SWBAT define periodicity. SWBAT describe the periodic trends for valence electrons, atomic radius, and electronegativity.

NOTES TITLE: PERIODICITY AND PERIODIC TRENDS

CHEMISTRY & YOU How are trends in the weather similar to trends in the properties of elements? Although the weather changes from day to day, the weather you experience is related to your location on the globe. Copyright © Pearson Education, Inc. , or its affiliates. All Rights Reserved. .

Periodicity is… Key Point #1: Periodicity is the quality or state of being regularly recurrent or having periods.

Periodic Trends Key Point 2: The trends and patterns on the periodic table help us both compare and contrast elements.

Note-Taking Strategy Use the chart in your notes – like this…. Vocab Word Periodic Trend

Nab that Vocab! Copy your definitions from yesterday into the table in your notes! Repeated writing may help you remember the definitions! 1. Valence electrons: ? ? ? 2. Atomic radius: ? ? ? 3. Electronegativity: ? ? ?

Note-Taking Strategy Use the chart in your notes – like this…. Vocab Word Periodic Trend Valence electrons: ? ? ? Atomic radius: ? ? ? Electronegativity: ? ? ? To be filled in!

Note-Taking Strategy Use the chart in your notes – like this…. Vocab Word Periodic Trend Valence electrons: electrons in the outermost (or outside/biggest) energy level Atomic radius: ? ? ? Electronegativity: ? ? ? To be filled in!

Note-Taking Strategy Use the chart in your notes – like this…. Vocab Word Periodic Trend Valence electrons: electrons in the outermost (or outside/biggest) energy level Atomic radius: how big an atom is, also known as atomic size Electronegativity: ? ? ? To be filled in!

Note-Taking Strategy Use the chart in your notes – like this…. Vocab Word Periodic Trend Valence electrons: electrons in the outermost (or outside/biggest) energy level Atomic radius: how big an atom is, also known as atomic size Electronegativity: the ability of an atom to attract electrons to itself in a chemical bond; how much an atom wants electrons To be filled in!

LOOK OUT! VALENCE ELECTRONS TREND

Let’s look at Bohr Models… http: //www. chemicalelements. com/show/electronconfig. html

TREND: Valence Electrons # of valence electrons increases from 1 -8 as you go left to right (#A on top of PT) 1 ------------------>8

Valence Electrons Write on your PT

LOOK OUT! ATOMIC RADIUS TREND

Ranked Small to Large: Na, K, Rb, Cs

LOOK OUT! ELECTRONEGATIVIT Y TREND

Ranked Small to Large: Ga, Ge, As, Se

Electronegativity Values for Selected Elements in Paulings H 2. 1 Li 1. 0 Be 1. 5 B 2. 0 C 2. 5 N 3. 0 O 3. 5 F 4. 0 Na 0. 9 Mg 1. 2 Al 1. 5 Si 1. 8 P 2. 1 S 2. 5 Cl 3. 0 K 0. 8 Ca 1. 0 Ga 1. 6 Ge 1. 8 As 2. 0 Se 2. 4 Br 2. 8 Rb 0. 8 Sr 1. 0 In 1. 7 Sn 1. 8 Sb 1. 9 Te 2. 1 I 2. 5 Cs 0. 7 Ba 0. 9 Tl 1. 8 Pb 1. 9 Bi 1. 9

Using Graphs to Understand the Relationship Between Atomic Radius and Electronegativity

GROUP 1 H + Alkali Metals

PERIOD 1 Li - Ne

Why is this relationship true? vs. LARGE EN = SMALL AR LARGE AR = SMALL EN

Work Time Complete worksheet from Ms. Stroh Help each other and ask questions when you’re all stumped! When you finish, you may work on your Periodic Table

Exit Question State the left to right trend for valence electrons. 2. Which element has the largest atomic radius: Ag, Cu, Hg, or Zn? 3. Which element has the largest electronegativity: Ag, Cu, Hg, or Zn? HOMEWORK: PERIODIC TRENDS WORKSHEET 1.